Issue No. 06 - June (1968 vol. 17)
A.V. Aho , Bell Telephone Labs., Inc.
Broadly speaking, an automaton can be considered to be an abstract device consisting of an input tape, a finite state control, and some type of auxiliary memory. Automata have been classified according to the structure of the auxiliary memory and the manner in which information can be stored and retrieved from this memory.
A. Aho, "R68-27 Programming Languages for Automata," in IEEE Transactions on Computers, vol. 17, no. , pp. 606, 1968.