Ehlers, M., 2009. Future Earth Observation Sensors of Relevance – Integrated Perspective for Global Urban Monitoring. In: Gamba, P. and M. Herold (Eds.), Global Mapping of Human Settlements: Experiences, Data Sets, and Prospects, Taylor and Francis, Boca Raton, FL, pp. 321-337.

Ehlers, M., K. Jacobsen and J. Schiewe, 2009. High Resolution Image Data and GIS. In: Madden, M. (Ed.), ASPRS Manual of GIS, American Society for Photogrammetry and Remote Sensing, Bethesda, MD, pp. 721-777.

Schiewe, J., M. Ehlers and M. Gähler, 2009. Fusion of Remote Sensing and GIS Data for Detecting and Monitoring Landscape Changes. In: Madden, M. (Ed.), Landscape Analysis Using Geospatial Tools: Community to the Globe, American Society for Photogrammetry and Remote Sensing, Bethesda, MD (submitted).

Grendus, B., J. Schiewe und M. Ehlers, 2009. Ein Konzept zur nachhaltigen Sicherung und Pflege von E-Learning-Modulen für die Geoinformatik unter dem Aspekt der Vermarktung und Kooperation. In: Appelrath, H.-J. und L. Schulze (Hrsg.), Auf dem Weg zu exzellentem E-Learning, Waxmann Verlag, Münster, pp. 184-195.

Ehlers, M. and T. Kastler, 2009. Environmental Monitoring. In: Bullinger, H.-J. (Ed.) Technology Guide – Principles, Applications, Trends, Springer-Verlag, Berlin Heidelberg, pp. 382-387.
Schiewe, J., M. Ehlers, C. Kinkeldey, D. Tomowski, 2009. From Fuzzy and Object Based Classification to Fuzzy and Object Based Uncertainty Evaluation. In: Michel, U., D. L. Civco, M. Ehlers and H. J. Kaufmann (Eds.), Remote Sensing for Environmental Monitoring, GIS Applications and Geology IX, Proceedings of SPIE (in print).

Ehlers, M., 2008. Geospatial Integration and Fusion Techniques for Environmental Monitoring and Security. In: Coskun, H.G., H.K. Cigizoglu and M.D. Maktav (Eds.). Integration of Information for Environmental Security, NATO Science for Peace and Security Series, Springer-Verlag, pp. 17-46.

Ehlers, M. and D. Tomowski, 2008. On Segment Based Image Fusion. In: Blaschke, T., S. Lang and G. Hayes (Eds.), Object-Based Image Analysis – Spatial Concepts for Knowledge-Driven Remote Sensing Applications, Springer Lecture Notes in Geoinformation and Cartography, pp. 735-754.

Klonus, S., P. Rosso and M. Ehlers, 2008. Image Fusion of High Resolution TerraSAR-X and Multispectral Electro-Optical Data for Improved Spatial Resolution. In: Jürgens, C. (Ed.), Remote Sensing - New Challenges of High Resolution, Bochum, pp. 249-264.

Ehlers, M. and S. Klonus, 2008. Quality Assessment for Multitemporal and Multi Sensor Image Fusion. In: Michel, U., D. L. Civco, M. Ehlers and H. J. Kaufmann (Eds.), Remote Sensing for Environmental Monitoring, GIS Applications and Geology VIII, Proceedings of SPIE Vol 7110, Bellingham, WA, pp. 71100T1-71100T9.

Na, Y., M. Ehlers, J. Meng, Z. Yang, 2008. Multi-Directional Decomposition and Directional Contrast Based Remote Sensing Image Fusion. In: Michel, U., D. L. Civco, M. Ehlers and H. J. Kaufmann (Eds.), Remote Sensing for Environmental Monitoring, GIS Applications and Geology VIII, Proceedings of SPIE Vol 7110, Bellingham, WA, pp. 71100U1-71100U9.

Ehlers, M., 2008. Multi-Image Fusion in Remote Sensing: Spatial Enhancement vs. Spectral Characteristics Preservation. In: Bebis, G., R. Boyle, B. Parvin, D. Koracin, P. Remagnino, F. Porikli, J. Peters, J. Klosowski, L. Arns, Y.K. Chun, T.-M. Rhyne and L. Monroe (Eds.), Advances in Visual Computing, Part II, Springer Verlag, pp. 75-84.

Michel, U., S. Klonus, M. Ehlers and P. Astrand, 2007. Image Fusion of Multitemporal and Multisensoral Data. In: Gomarasca, M.A. (Ed.), GeoInformation in Europe, Millpress Science Publishers, Rotterdam, pp. 257-266.

Ehlers, M., 2007. New Developments and Trends for Urban Remote Sensing. In: Weng, Q. and D. Quattrochi (Eds.), Urban Remote Sensing, CRC Press, Taylor and Francis Group, Boca Raton, London, New York, pp. 357-375.

Ehlers, M., 2007. Integration Taxonomy and Uncertainty. In: Mesev, V. (Ed.). Integration of Remote Sensing and GIS, Wiley and Sons, London, pp. 17-42.

Schiewe, J. and M. Ehlers, 2007. Fuzzy Models for Handling Uncertainty in the Integration of High Resolution Remotely Sensed Data and GIS. In: Morris, A. and S. Kokhan (Eds.), Geographic Uncertainty in Environmental Security, NATO Science for Peace and Security Series, Springer-Verlag, pp. 89-106.

Ehlers, M. and U. Michel, 2007. Introduction. In: Ehlers, M. and U. Michel (Eds.), 2007. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, Proceed-ings of SPIE Vol. 6749, Bellingham, WA, p. xv.

Na, Y., M. Ehlers, H. Ji and L. Shi, 2007. Contents Correlation and Genetic Algorithm Based Remote Sensing Images Fusion. In: Ehlers, M. and U. Michel (Eds.), 2007. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, Proceedings of SPIE Vol. 6749, Bellingham, WA, pp. 67490O1-67490O11.

Watson, R.P. and M. Ehlers, 2006. New and Emerging Instruments and Some Emerging Trends for Remote Sensing of Human Settlements. In: Ridd, M. and J. D. Hipple (Eds.), The Manual of Remote Sensing, 3rd Edition, Vol. 5: Remote Sensing of Human Settlements, American Society for Photogrammetry and Remote Sensing, Bethesda, MD, pp. 713-738.

Ehlers, M. 2006. Geodateninfrastrukturen. In: Traub, K. P. und J. Kohlus (Hrsg.), GIS im Küstenzonenmanagement: Grundlagen und Anwendungen, Wichmann Verlag, Heidelberg, pp. 138-149.

Bohmann, G. und M. Ehlers, 2006. Umweltmonitoring. In: Bullinger, H.-J. (Hrsg.) Technologieführer - Grundlagen, Anwendungen und Trends, Springer-Verlag, Berlin Heidelberg, pp. 500-505.

Ehlers, M., 2006. Geoinformatik: Neue wissenschaftliche Disziplin oder alter Wein in neuen Schläuchen? Festschrift 125 Geodäsie an der Universität Hannover, Wissenschaftliche Arbeiten der Fachrichtung Vermessungswesen der Universität Hannover. Nr. 263, pp. 169-180.

Ehlers, M., 2006. On Image Fusion and Segmentation. In: Ehlers, M. and U. Michel (Eds.), 2006. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VI, Proceedings of SPIE Vol. 6366, Bellingham, WA, pp. 6366OV1-6366OV11.

Na, Y., M. Ehlers and W. Yang, 2006. Visual Perception Based Different Scale Remote Sensing Images Fusion with Multi-Wavelet Transform. In: Ehlers, M. and U. Michel (Eds.), 2006. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VI, Proceedings of SPIE Vol. 6366, Bellingham, WA, pp. 6366OU1-6366OU10.

Ehlers, M., 2005. Sensoriamento Remoto para usuários de SIG - sistemas sensores e métodos: as exigências e a realidade. In: Blaschke, T. & Kux, H. (Eds.) Sensoriamento Remoto e SIG avançados - novos sistemas sensores, métodos inovadores, pp.19-32, Oficina de Tex-tos Ltda, São Paulo, Brasilien.

Na, Y., M. Ehlers and W. Yang, 2005. Multi-Wavelet Transform Based Remote Sensing Image Fusion. In: Erasmi, S., B. Cyffka and M. Kappas (Eds.), Remote Sensing & GIS for Environmental Studies: Applications in Geography, Verlag E. Goltze, Göttingen, pp. 303- 308.

Frangesch, A., A. Greiwe and M. Ehlers, 2005. Semantic Evaluation of High Resolution Low-Cost Digital Camera Data for Urban Classification. In: Ehlers, M. and U. Michel (Eds.), 2005. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology V, Proceedings of SPIE Vol. 5983, Bellingham, WA, pp 598302/1-598302/9.

Na, Y., M. Ehlers, W. Yang, L. Shi, 2005. Adaptive Remote Sensing Image Fusion with Multi-Wavelet Transform. In: Ehlers, M. and U. Michel (Eds.), 2005. Remote Sensing for Environmental Monitoring, GIS Applications, and Geology V, Proceedings of SPIE Vol. 5983, Bellingham, WA, pp 598302/1-598302/9.

Ehlers, M., 2004. Introduction. In: Ehlers, M., H. J. Kaufmann and U. Michel (Eds.), Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III, Proceedings of SPIE Vol. 5239, Bellingham, WA, p. xiii.

Ehlers, M., 2004. Remote Sensing for GIS Applications: New Sensors and Analysis Methods. In: Ehlers, M., H. J. Kaufmann and U. Michel (Eds.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III, Proceedings of SPIE Vol. 5239, Belling-ham, WA, pp. 1-13.

Greiwe, A., M. Bochow and M. Ehlers, 2004. Fusion of Multisensor Remote Sensing Data for Urban Land Cover Classification. In: Ehlers, M. (Ed.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III, Proceedings of SPIE Vol. 5239, Bellingham, WA, pp. 306-313.

Schiewe, J., M. Ehlers und B. Grendus, 2004. Fernstudienmaterialien Geoinformatik (FerGI) - Konzeption und erste Implementierungsbeispiele. In: Plümer, L. und H. Asche (Hrsg.) Geoinformation- Neue Medien für eine neue Disziplin, Wichmann Verlag, Heidelberg, pp. 143-153.

Ehlers, M., 2004. Spectral Characteristics Preserving Image Fusion based on Fourier Domain Filtering. In: Ehlers, M., F. Posa, H. J. Kaufmann, U. Michel and G. De Carolis (Eds.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IV, Proceed-ings of SPIE Vol. 5574, Bellingham, WA, pp 1-13.

Greiwe, A. and M. Ehlers, 2004. Segment-based Classification Algorithm for Multisensor Data. In: Ehlers, M., F. Posa, H. J. Kaufmann, U. Michel and G. De Carolis (Eds.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IV, Proceedings of SPIE Vol. 5574, Bellingham, WA, pp 32-42.

Na, Y., M. Ehlers, W. Yang, 2004. Remote Sensing Image Fusion with Multi-Wavelet Transform. In: Ehlers, M., F. Posa, H. J. Kaufmann, U. Michel and G. De Carolis (Eds.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IV, Proceedings of SPIE Vol. 5574, Bellingham, WA, pp. 14-22.

Ehlers, M., S. Jung und U. Michel, 2003. Vorwort. In: Ehlers, M., S. Jung und U. Michel (Hrsg.) Integrative Methodenentwicklung zur Auswertung moderner GIS- und Fernerkun-dungsdaten in den Geowissenschaften, Materialien Umweltwissenschaften Vechta (MUWV), Heft 15, p. 1.

Schiewe, J. und M. Ehlers, 2003. Vorwort: Bewährtes und viel Neues. In: Schiewe, J. und M. Ehlers (Hrsg.) Geoinformatik 03: Ausgewählte Themen der Forschungsgruppe GIS/Ferner-kundung, Materialien Umweltwissenschaften Vechta (MUWV), Heft 17, pp. 5-6.

Ehlers, M., 2003. Zur Entwicklung der Geoinformatik. ibid, pp. 7-13.

Ehlers, M., 2003. Fernerkundung für GIS-Anwender. ibid, pp. 14-21.

Ehlers, M., S. Jung and K. Stroemer, 2003. Design and Implementation of a GIS Based Bicycle Routing System for the World Wide Web. ibid, pp. 31-35.

Ehlers, M. and M. Möller, 2003. Veterinary Information System: A GIS Based Toolbox for Handling and Analyzing Epidemiological Risk Factors in Densely Populated Livestock Areas. ibid, pp. 86-92.

Ehlers, M., J. Schiewe and M. Möller, 2003. Ultra High Resolution Remote Sensing for Urban Information Systems and 3D City Modeling. ibid, pp. 100-107.

Ehlers, M., M. Gähler and R. Janowsky, 2003. Automated Analysis of Ultra High Resolution Remote Sensing Data for Biotope Type Mapping: New Possibilities and Challenges. ibid, pp. 123-131.

Ehlers, M., 2003. Introduction. In: Ehlers, M. (Ed.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II, Proceedings of SPIE Vol. 4886, Bellingham, WA, p. xiii.

Ehlers, M. and M. Möller, 2003. Veterinary Information System: a GIS-Based Toolbox for Handling and Analysing Epidemiological Risk Factors in Densely Populated Livestock Areas. In: Huirne, R.B. and H.W. Windhorst (Eds.) Development of Prevention and Control, Strategies to Address Animal Health and Related Problems in Densely Populated Livestock Areas of the Community, European Commission, Final Report FAIR5-CT97-3566, Brüssel, pp. 26-38.

Ehlers, M., 2002. Fernerkundung für GIS-Anwender: Sensoren und Methoden zwischen Anspruch und Wirklichkeit. In: Blaschke, T. (Hrsg.) Fernerkundung und GIS: Neue Sensoren – innovative Methoden, Wichmann Verlag, Heidelberg, pp. 10-23.

Ehlers, M., R. Janowsky and M. Gähler, 2002. New Remote Sensing Concepts for Environmental Monitoring. In: Ehlers, M. (Ed.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology, Proceedings of SPIE Vol. 4545, Bellingham, WA, pp. 1-12.

Ehlers, M., 2002. Introduction. In: Ehlers, M. (Ed.) Remote Sensing for Environmental Monitoring, GIS Applications, and Geology, Proceedings of SPIE Vol. 4545, Bellingham, WA, p. ix.

Möller, M., M. Ehlers, M. Gähler und R. Janowsky, 2001. Automatisierte Biotoperfassung in den Uferrandbereichen der Elbe im Zuge der Fahrrinnenanpassung 1999. In: Windhorst, H.W. (Hrsg.) Beiträge zur Geographie der Meere und Küsten, Vechtaer Studien zur An-gewandten Geographie und Regionalwissenschaft, Band 22, pp. 108-115.

Czeranka, M., und M. Ehlers, 2000. GIS als Werkzeug für die Flächenbewertung und Flächensuche in der Bauleitplanung. In Lange, N. de (Hrsg.), Geoinformationssysteme in der Stadt- und Umweltplanung, Osnabrücker Studien der Geographie, Band 19, pp. 23-36 u. 145-147.

Ehlers, M., 2000. Fernerkundung und Geographische Informationssysteme: Von der Datenintegration zur integrierten Analyse, Lokal verankert – weltweit vernetzt. Verhandlungsband des 52. Deutschen Geographentages, Franz Steiner Verlag, Stuttgart, pp. 586-591.

Ehlers, M., 2000. Zur Entwicklung der Geoinformatik: Integration von Bildanalyse und Geo-Informationssystemen (GIS). Festschrift zum 65. Geburtstag von Prof. Bernhard Wrobel, Schriftenreihe der Fachrichtung Geodäsie, TU Darmstadt, pp. 57-68.

Ehlers, M., F. Broecker, S. Jung, M. Möller und U. Rhein, 1999. Zur Rolle der Geoinformatik in den Umweltwissenschaften. In: Ehlers, M. und J. Schiewe (Hrsg.), Geoinformatik 99: Ausgewählte Themen der Forschungsgruppe GIS/Fernerkundung, Materialien Umweltwissenschaften Vechta (MUWV), Heft 5, pp. 1-9.

Ehlers, M., 1999. Availability of Core and Baseline Data for Global Mapping: GIS to the Rescue? ibid, pp. 10-16.

Gahegan, M. and M. Ehlers, 1999. A Framework for Modeling of Uncertainty in an Integrated Geographic Information System. ibid, pp. 17-26.

Ehlers, M. und M. Czeranka, 1999. Spatial Decision Support System und GIS. ibid, pp. 27-36.

Jung, S., S.A. Voser and M. Ehlers, 1999. Hybrid Spatial Analysis as a Foundation for Inte-grated GIS. ibid, pp. 37-41.

Ehlers, M., 1998. On European Geospatial Information Infrastructures: A Critical View, Fest-schrift Gottfried Konecny zur Emeritierung. Wissenschaftliche Arbeiten der Fachrichtung Vermessungswesen der Universität Hannover, Nr. 227, pp. 95-104.

Ehlers, M., 1997. Rectification and Registration. In: Star, J.L., J.E. Estes and K.C. McGwire (Eds.) Integration of Remote Sensing and GIS, Cambridge University Press, New York, pp. 13-36.

Ehlers, M. und M. Möller, 1997. Sehr hoch auflösende elektrooptische Satellitensensoren. Perspektiven zur angewandten Nutzung zukünftiger und bestehender Satellitenbildprodukte. In: Ehlers, M. und U. Rhein (Hrsg.), Neue Fernerkundungsentwicklung in den Umweltwissenschaften, ISPA Mitteilungen, Heft 28, pp. 19-35.

Jung, S., J. Albrecht and M. Ehlers, 1997. Multi-Level Comparative Analysis of Spatial Operators in GIS and Remote Sensing as a Foundation for an Integrated GIS. In: Förstner, W. and L. Plümer (Eds.), Semantic Modeling for the Acquisition of Topographic Information from Images and Maps, Birkhäuser Verlag, Basel, pp. 72-88.

Ehlers, M., 1997. Umweltmanagement für das 21. Jahrhundert: Was leisten Geographische Informationssysteme und Fernerkundung? In: Ehlers, M. und M. Möller (Hrsg.), Umwelt-management für das 21. Jahrhundert/European Geospatial Database Research, Materialien Umweltwissenschaften Vechta (MUWV), Heft 2, pp. 2-9.

Ehlers, M., 1997. European Spatial Databases Research - Thoughts and Comments. In: Ehlers, M. und M. Möller (Hrsg.), Umweltmanagement für das 21. Jahrhundert/European Geospatial Database Research, Materialien Umweltwissenschaften Vechta (MUWV), Heft 2, pp. 10-15.

Ehlers, M., 1996. Fernerkundung für Umweltanwendungen. In: Bienlein, J., L. Dreschler-Fischer, H. Spitzer (Hrsg.) Fernerkundung und Bildverarbeitung, CENSIS-Report-19-96, Universität Hamburg, pp. 299-305.

Ehlers, M., 1996. Remote Sensing and Geographic Information Systems: Advanced Technologies for Environmental Monitoring and Management. In: Singroy, V.H., D.D. Nebert, and A.I. Johnson (Eds.), Remote Sensing and GIS for Site Characterization: Applications and Standards, ASTM STP 1279, West Conshohocken, PA, pp. 17-25.

Albrecht, J. and M. Ehlers, 1994. Virtual Geographic Information System (VGIS). In: Nievergelt, J., T. Roos, H.-J. Schek and P. Widmayer (Eds.) IGIS'94: Geographic Information Systems, Springer-Verlag, Berlin Heidelberg, pp. 55-58.

Ehlers, M., 1993. Developments in Remote Sensing: Techniques and Applications. In: Czeranka, M. and M. Ehlers (Eds.) Forschungsberichte zu GIS und Fernerkundung: neue Konzepte und Anwendungen. Vechtaer Studien zur Angewandten Geographie und Regio-nalwissenschaft, Band 9, pp. 39-47.

Ehlers, M., 1993. Integration of GIS, Remote Sensing, Photogrammetry and Cartography: the Geoinformatics Approach. ibid, pp. 59-65.

Ehlers, M. and M. Czeranka, 1993. GIS im Aufbau- und Zusatzstudium "Umweltmonitoring". ibid, pp. 67-74.

Ehlers, M., 1993. GIS Training and Education: Status and Concepts. ibid, pp. 75-83.

Ehlers, M., 1993. Hybrid Workstations in Geoinformatics: Requirements and Potential. ibid, pp. 85-88.

Ehlers, M., 1993. Remote Sensing and Geographic Information Systems: Image-Integrated GIS. ibid, pp. 89-102.

Ehlers, M. and D.R. Steiner, 1993. A New Paradigm in the Systems Aspects for the Processing of Remotely Sensed Data. ibid, pp. 103-108.

Ehlers, M., 1993. Mapping Requirements for GIS Applications. Schriftenreihe des Institutes für Photogrammetrie und Ingenieurvermessungen, Universität Hannover , Vol. 15, pp. 245-253.

Ehlers, M., 1992. Data Types and Data Structures for Integrated Geographic Information Systems. In: Star, J. L. (Ed.) The Integration of Remote Sensing and Geographic Information Systems, ASPRS, Bethesda, Maryland, pp. 51-73.

Ehlers, M., 1992. Geoinformatics: An Integrated Approach for Acquisition, Processing and Production of Geo-Data. In: Drees, A. and S. Binder (Eds.) Think Tank. Invited Papers and Results of the Advanced Workshop on Surveying and Mapping Education in a Global Envi-ronment, Bund der Öffentlich bestellten Vermessungsingenieure e.V. (BDVI), Köln, pp. 73-80.

Ehlers, M., 1992. Summary of the Atlantic Institute Think Tank "Surveying Education in a Global Environment". In: Drees, A. and S. Binder (Eds.) Think Tank. Invited Papers and Results of the Advanced Workshop on Surveying and Mapping Education in a Global En-vironment, Bund der Öffentlich bestellten Vermessungsingenieure e.V. (BDVI), Köln, pp. 89-91.

Ehlers, M., 1992. Remote Sensing and Geographic Information Systems: Image-Integrated GIS. In: Johnson, A. I., C. B. Petterson and J. L. Fulton (Eds.) Geographic Information Sys-tems (GIS) and Mapping - Practices and Standards, ASTM STP 1126, Philadelphia, Penn-sylvania, pp. 53-67.

Ehlers, M., 1992. Panel Discussion Statement: Research Agenda of the National Center for Geographic Information and Analysis (NCGIA). In: Johnson, A.I., C.B. Petterson and J.L. Fulton (Eds.) Geographic Information Systems (GIS) and Mapping - Practices and Stan-dards, ASTM STP 1126, Philadelphia, Pennsylvania, pp. 320-322.

Ehlers, M. and L. Blesius, 1991. Progress in Image Processing Workstations for Remote Sensing. In: Ebner, H., D. Fritsch and C. Heipke (Eds.) Digital Photogrammetric Systems, Wichmann Verlag, Karlsruhe, pp. 291-294.

Ehlers, M., 1991. Digitization, Digital Editing and Storage of Photogrammetric Images. Beiträge zur 43. Photogrammetrischen Woche. Schriftenreihe des Institutes für Photogrammetrie der Universität Stuttgart, No. 15, pp. 187- 193

Ehlers, M., 1990. Integration of Remote Sensing Image Analysis and GIS: Status and Trends. Festschrift Gottfried Konecny zum 60. Geburtstag, Schriftenreihe des Institutes für Photogrammetrie und Ingenieurvermessungen, Universität Hannover, No. 13, pp. 109-119.

Ehlers, M., 1990. Editor's Foreword. ISPRS Commission II/VII International Workshop "Advances in Spatial Information Extraction and Analysis for Remote Sensing", American Society for Photogrammetry and Remote Sensing (ASPRS), Bethesda, Maryland, pp. iii - vii.

Ehlers, M., 1990. DIRIGO: A Macintosh II Based Image Processing System. In: Ehlers, M. (Ed.) ISPRS Commission II/VII International Workshop "Advances in Spatial Information Extraction and Analysis for Remote Sensing", ASPRS, Bethesda, Maryland, pp. 101-109.