PLASMA - PLAnner-like System Modeled on Actors. Carl Hewitt, 1975. The
first actor language. Originally called Planner-73, and implemented in
MacLisp. Lisp-like syntax, but with several kinds of parentheses and
brackets. "A PLASMA Primer", B. Smith et al, AI Lab Working Paper 92, MIT
Oct 1975. "Viewing Control Structures as Patterns of Passing Messages", C.
Hewitt, AI Lab Memo 410, MIT 1976.
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