title: metu object-oriented dbms. authors: cetin ozkan , cem evrendilek , yuksel saygin , ilker altintas , ismailcem budak arpinar , mehmet altinel , tansel okay , ilker durusoy , asuman dogac. venue: sigmod conference. year: 1994
title: repositories and object oriented databases. authors: philip a. bernstein. venue: acm sigmod record. year: 1998