Brdiczka, O.O.BrdiczkaKnipping, L.L.KnippingLudwig, N.N.LudwigMertens, RobertRobertMertens2022-03-112022-03-112009https://publica.fraunhofer.de/handle/publica/3659742-s2.0-77949530902en005The Fourth IEEE International Workshop on Multimedia Technologies for E-Learning (MTEL 2009)conference paper