@article{Akkermans1993,
  author = {Akkermans, Hans and van Harmelen, Frank and Schreiber, Guus and Wielinga, Bob},
  journal = {International Journal of Intelligent Systems},
  number = {2},
  title = {{A formalization of knowledge-level models for knowledge acquisition}},
  url = {http://www.ecn.nl/publications/O/1990},
  volume = {8},
  year = {1993},
  keywords = {Specification Languages for KBS},
  urlPaper = "http://www.cs.vu.nl/~frankh/postscript/IJIS93.pdf"
}

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