N. Ya. Vilenkin ; tr. from the Russian by Mark Samokhvalov. P.S. Kireev ; tr.from the Russian by Mark Samokhvalov. N. Rykalin ; tr. from the Russian by O. Glebov. S.M. Nikol'skii ; tr. from the Russian by J.M. Danskin. V. Rydnik ; tr. from the Russian by G. Yankovsky. V. Vladimirow ; tr. from the Russian by P. Smirnov. V.N. Baikov ; tr. from the Russian by I.V. Savin. N. Piskunov ; tr. from the Russian by George Yankovsky. A. Betekhtin ; tr. from the Russian by V. Agol. A. Kutepov ; tr. from the Russian by Oleg Meshkov.