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@techreport{WHHHP98, author = {Thomas Walter and Hans Hänni and Martin Hildebrand and Stefan Hinni and Bernhard Plattner}, title = {Kosten und Nutzen von Teleteaching am Beispiel des Telepoly-Projektes}, institution = {Computer Engineering and Networks Lab (TIK), Swiss Federal Institute of Technology (ETH) Zurich}, number = {63}, month = {Nov}, year = {1998} }