Black, A. Hutchinson, N. Jul, E. and H. Levy. "Object structure in the emerald system"

[OOPSLA 1986] (1986) SIGPLAN Notices 21(11) November 1986 (OOPSLA - Conference on Object Oriented Programming Systems Languages and Applications 1986)  

Languages mentioned Emerald {1987} polymorphic object-oriented distributed programming language/environment