1. A. J. Perlis, R. Iturriaga, and T. A. Standish, ?A Definition of Formula ALGOL,? Carnegie Institute of Technology, March, 1966.
2. V. G. Bodnarchuk and V. M. Glushkov, et al., ?ANALITIK (a language for describing computational processes involving application of analytic transformations)? collection: Theory of Automata [in Russian], no. 1, izd. IK AN UkrSSR, Kiev, 1968.
3. Collection: Computers and Thought [Russian translation], Mir, Moscow, 1967.