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@inproceedings{WHHP99, 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 Application}, address = {Seattle, Washington, USA}, booktitle = {11th Annual World Conference on Educational Multimedia, Hypermedia & Telecommunications}, month = {Jun}, year = {1999} }