@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}
}