@inbook { 5993, title = {Mediendidaktische Konzeption und Implementierung von Online Modulen in die Hochschullehre}, booktitle = {GIS-Anwendungen und e-Learning}, year = {2004}, publisher = {Wichmann Verlag}, organization = {Wichmann Verlag}, address = {Berlin}, author = {Michael Kerres and Petschenka, Anke}, editor = {Kaule, Giselher and M{\"u}ller, Mark} }