by S.M. Bilenky ; translated by G.B. Pontecorvo. by A.G. Sitenko ; translated by O.D. Kocherga. by M.I. Klinger ; translated by J.B. Sykes. by A.S. Davydov ; translated by D. Oliver. by S. M. Bilenky. Translated and edited by Frances Pardee. by I.M. Tsidilkovski ; translated by R.S. Wadhwa. by Li Jian ; translated by Yijin Wert. by V. M. Kamenkovich ; translated by R. Radok.