François Bancilhon, Costantino Thanos, Dennis Tsichritzis (Eds.): Advances in Database Technology - EDBT'90. International Conference on Extending Database Technology, Venice, Italy, March 26-30, 1990, Proceedings. LNCS 416 Springer 1990

• Gilles Barbedette: LISP O2: a Persistent Object-Or (1990) Gilles Barbedette: LISP O2: a Persistent Object-Oriented Lisp. 215-233, reprinted from EDBT 1990: pp332-347