@inproceedings{Apostel1961,
  crossref  = {Freudenthal1961},
  author    = {Leo Apostel},
  editor    = {Hans Freudenthal},
  title     = {{Towards the formaly study of models in the non-formal
              sciences}},
  booktitle = {{The Concept and the role of the model in mathematics
              and natural and social sciences}},
  pages     = {1--37},
  year      = 1961,
}

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