N. Malzahn, M. Pokrandt, and H. Hoppe. Proceedings of the 16th International Conference on Computers in Education (ICCE 2008), page 499-504. Taipei, Taiwan, (2008)
N. Malzahn, M. Pokrandt, and H. Hoppe. Proceedings of the 16th International Conference on
Computers in Education (ICCE 2008), page 499--504. Taipei, Taiwan, (2008)