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@article{WHH99, author = {Thomas Walter and Hans Hänni and Martin Hildebrand and Stefan Hinni and Patrick Kunz and Bernhard Plattner}, title = {Das Teleteaching-System Telepoly - Implementation und Erfahrungen -}, journal = {Praxis der Informationsverarbeitung und Kommunikation}, pages = {87--96}, volume = {2}, month = {Jun}, year = {1999} }