[by] I. G. Kaplan. Translated by J. Gerratt. by J. C. Simon ; Translated by J. Howlett [by] I.M. Gibalo. Translated by J. Schmorak. [by] L.A. Dorfman. Translated by N. Kemmer. by J. P. Mathieu ; translated by J. Warren Blaker. by R. Courant. Translated by E. F. McShane. [by] I. V. Pyatnitskii. Translated by N. Kaner. by Harro G. Heuser ; translated by John Horv?ath. by J.E. Pin ; translated by A. Howie. by Jean Dufay; translated by A.J. Pomerans.