Fizika primesnych centrov v kristallach : materialy Meždunarodnogo seminara "Izbrannyje problemy teorii primesnogo centra kristalla", Tallin, 21-26 sentjabrja 1970 g. = Physics of impurity centres in crystals : proceedings of the international seminar "Selected problems in the theory of impurity centres in crystals", Tallinn, september 21-26, 1970 - Zavt, G. S. (Akademija nauk Estonskoj SSR, Institut fiziki i astronomii, 1972)