Computer aided design in medical domain: a new viewpoint towards computer aided education. - Rossen Rashev; Reinhard Oppermann; Helmut Simm (HCI (2), 1999)

Supporting Learner in Exploratory Learning Process in an Interactive Simulation based Learning System. - Reinhard Oppermann; Kinshuk; Akihiro Kashihara; Rossen Rashev; Helmut Simm (Software-Ergonomie, 1999)