ctors. {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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