519 Gne L Gnedenko, Boris Vladimirovich, 1912- Limit distributions for sums of independent random variables by B.V. Gnedenko and A, N. KoImogorov. Tr. from the Russian and annotated by K. L. Chung. Massachusetts, Addison- Wesley Publishing, 1954 264 p. ilus. 24 cm Bibliografía: p. 257-261