@conference{Fran97,
	author = {Franze, K., Neumann, O., Rennecke, S., Schill, A.},
	title = {An Infrastructure for Collaborative Teleteaching},
	year = {1997},
	publisher = {IASTED Int. Conf. on Intelligent Information Systems, Freeport, USA, Dez. 1997, pp. 476-480}
}