1. Yu. L. Ershov, ?Computable functionals of finite types,? Alg. Log.,11, No. 4, 367?437 (1972).
2. Yu. L. Ershov, ?Everywhere-defined continuous functionals,? Alg. Log.,11, No. 6, 657?665 (1972).
3. Yu. L. Ershov, The Theory of Numerations [in Russian], Vol. 2, Novosibirsk (1973).
4. Yu. L. Ershov, ?The theory of A-spaces,? Alg. Log.,12, No. 4, 369?416 (1973).
5. H. Rogers, Jr., Theory of Recursive Functions and Effective Computability, McGraw-Hill (1967).