1. Yu. V. Prokhorov, ?Convergence of stochastic processes and limiting theorems of the theory of probability,? Teoriya Veroyat. i ee Prim.,1, No. 2, 177?238 (1956).
2. A. V. Skorokhod, ?Limiting theorems for stochastic processes,? Teoriya Veroyat. i ee Prim.,1, No. 3, 289?319 (1956).
3. A. A. Borovkov, ?The convergence of distributions of functionals of stochastic processes,? Usp. Matem. Nauk.,27, No. 1, 3?41 (1972).