@inproceedings{Schr88a,
   author = {M.~Schrefl AND E.J.~Neuhold},
   booktitle = {{Proceedings of the Fourth International Conference on Data Engineering (ICDE `88), Los Angeles, Calif., U.S.A., February 1--5, 1988}},
   pages = {4--13},
   title = {{Object class definition by generalization using upward inheritance}},
   year = {1988}
}
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