1. Yanov, Yu. I.: On logical algorithms schemata. Cybernetics Problems 1, Fizmatgiz, Moscow (1961)
2. Ershov, A. P.: Operator algorithms. III (On operator Yanov schemata). Cybernetics Problems 20, Nauka, Moscow (1967)
3. Lavrov, S. S.: On memory economy in closed program schemata. USSR Computational Mathematics and Mathematical Physics 1, no. 4 (1961)
4. Ershov, A. P.: Reduction of the problem of the memory economy during program writing to the problem of colouring graph verticles. Doklady Akademii Nauk SSSR 142, no. 4 (1962)