Daniel H. Fishman David Beech Jurgen Annevelink E. C. Chow Tim Connors J. W. Davis Waqar Hasan C. G. Hoch William Kent S. Leichner Peter Lyngbæk Brom Mahbod Marie-Anne Neimat Tore Risch Ming-Chien Shan W. Kevin Wilkinson 174-199 1990 Research Foundations in Object-Oriented and Semantic Database Systems db/books/collections/cardenas90.html#FishmanBACCDHHKLLMNRSW90