Ershov and Shura-Bura "The Early Development of Programming in the USSR"

Metropolis, N. (1980) Metropolis, N. et al., (eds.),A History of Computing in the Twentieth Century (Proceedings of the International Conference on the History of Computing, June 10 15, 1976) Academic Press, New York, 1980  

Languages mentioned PP-1 {1954} Russian automatic programming system PP-2 {1955} Russian automatic programming system PP-BESM {1954} PP for the BESM computer