|(theory)||Actors - A model for concurrency by Carl Hewitt. Actors
are autonomous and concurrent objects which execute
asynchronously. The Actor model provides flexible
mechanisms for building parallel and distributed software
["Laws for Communicating Parallel Processes", C. Hewitt et al, IFIP 77, pp. 987-992, N-H 1977].
["ACTORS: A Model of Concurrent Computation in Distributed Systems", Gul A. Agha