1. Agreement on core object methodology principles (ACOMP);ACOMP;L'OBJET,1996
2. Data Semantic Content — Metamodel for the Management of Shareable Data;ANSI,1995
3. Part-whole relations in object-centered systems: an overview;Artale;Data & Knowledge Engineering,1995
4. A metamodel approach for the management of multiple models and translation of schemes;Atzeni;Information Systems,1993