Proceedings of the Fourth International Workshop on Persistent Object Systems, Martha's Vineyard, MA, September 1990. Proceedings published as Implementing Persistent Object Bases: Principles and Practice, A. Dearle, G. Shaw, and S. Zdonik, editors, Morgan Kaufmann, 1991.

• B. Liskov, R. Gruber, P. Johnson, and L. Shrira. (1991) B. Liskov, R. Gruber, P. Johnson, and L. Shrira. "A Highly Available Object Repository for Use in a Heterogeneous Distributed System" pp255-266