PLAnner-like System Modelled 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].