N. G. Chetaev ; translatd from the Russian by Irene Aleksanova. I. E. Irodov ; translated from the Russian by Yuri Atanov. N.N.Lebedev ; translated from the Russian by A.Beknazarov. N. Chernov ; translated from the Russian by Felix Palkin. P. S. Kireev ; translated from the Russian by Mark Samokhvalov. H. D. Ikramov ; translated from the Russian by Oleg Efimov. V. Vladimirov ; translated from the Russian by Oleg Meshkov. G. G. Polikarpov ; translated from the Russian by Scripta Technica. V. V. Nekrasov ; translated from the Russian by Alexander Rosinkin. [N. Mikha鎖lov ; translated from the Russian by Glanys Ann Kozlov].