W. Friedrich, D. Jahn, and L. Schmidt. International Status Conference - Lead Projects "Human-Computer Interaction" (Saarbrücken 2001), page 79–89. Berlin, DLR, (2001)
W. Friedrich, D. Jahn, and L. Schmidt. International Status Conference - Lead Projects \dqHuman-Computer Interaction\dq (Saarbrücken 2001), page 79--89. Berlin, DLR, (2001)