Corradi, A. and Leonardi, L. "PO: an object model to express parallelism" pp152-155

[OOCP 1988] (1989) SIGPLAN Notices 24(04) April 1989 incoroporating Proceedings of the 1988 ACM SIGPLAN workshop on Object-based concurrent programming, San Diego  

Languages mentioned PO {2000} Concurrent OO Language