@inproceedings{TUC-CSCW/HHP03,
  author = "K. Herrmann and H. Hoppe and N. Pinkwart",
  title = "A Checking Mechanism for Visual Language Environments",
  year = 2003,
  booktitle = "Proceedings of the 11th International Conference on Artificial Intelligence in Education (AIED)",
  publisher = "IOS Press",
  number = 97
}