db/conf/sigmod/SmithRKHBC80.html John Miles Smith Charles Rich Jonathan J. King Peter Hitchcock Alexander Borgida Jaime G. Carbonell Consistency of Models (discussion). 72-76 PINGREE1980/P072.pdf 1980 conf/sigmod/80p Workshop on Data Abstraction, Databases and Conceptual Modelling db/conf/sigmod/pingree80.html#SmithRKHBC80