[By] L. M. Kachanov. [Translation from the Russian] Edited by M. B. Neiman. Authorized translation from the Russian. Authorized translation from the Russian. by J.Zenneck; translated from the German. by G. I. Epifanov ; translated from the Russian by Mark Samokhvalo Edited by A.S. Predvoditelev. Authorized translation from the Russian. by V.S. Fomenko. Edited by G.V. Samsonov. Authorized translation from the Russian. by Varlam Shalamov ; translated from the Russian by John Glad.