Programming languages & software engineering

Butler Lampson, W.W. Lichtenberger, M.W. Pirtle

Proceedings of the IEEE | December 1966, Vol 54(12): pp. 1766-1774

Reprinted in Computer Structures, ed. Bell and Newell, McGraw-Hill, 1971, pp 291-300.

Yuri Gurevich

Algebra and Logic (Russian) | July 1966, pp. 25-35

Yuri Gurevich

AMS Translations | October 1965, Vol 46: pp. 165-192

Yuri Gurevich

Algebra and Logic | April 1963, pp. 37-39