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@techreport{WHHP98, author = {Thomas Walter and Martin Hildebrand and Stefan Hinni and Bernhard Plattner}, title = {A System for the Cost-Value Evaluation of Teleteaching Systems and its Applcation}, institution = {Computer Engineering and Networks Lab (TIK), Swiss Federal Institute of Technology (ETH) Zurich}, number = {64}, month = {Nov}, year = {1998} }