@article{Menzel06,
  title = {Constraint-based Modeling and Ambiguity},
  author = {Wolfgang Menzel},
  year = {2006},
  url = {http://iospress.metapress.com/content/5nwhya5d50mje9y2/},
  tags = {rule-based, meta-model, modeling, constraints, Meta-Environment},
  researchr = {https://researchr.org/publication/Menzel06},
  cites = {0},
  citedby = {0},
  journal = {I. J. Artificial Intelligence in Education},
  volume = {16},
  number = {1},
  pages = {29-63},
}