1. I. R. Aksel'rod and L. F. Belous, ?The conversational system SIRIUS,? Upravl. Sist. Mash., No. 1 (1974).
2. P. Naur (editor), ?Revised report on the algorithmic language ALGOL 60,? Comm. Assoc. Comput. Mach.,6, No. 1 (1963).
3. A. van Wijngaarden (editor), ?Report on the algorithmic language ALGOL 68,? Numerische Math.,14 (1969).
4. A. P. Ershov (editor), The AL'FA System of Automatic Programming. A Collection of Articles [in Russian], Nauka, Sibirsk. Otd., Novosibirsk (1965).
5. L. P. Babenko, ?On the utilization of COBOL-like languages to describe translators,? Kibernetika, No. 5 (1965).