Author: I͡Ubileĭnai͡a respublikanskai͡a nauchnai͡a konferent͡sii͡a molodykh uchenykh, posvi͡ashchennoĭ 50-letii͡u obrazovanii͡a SSSR (14 th 1973 Minsk, Byelorussian S.S.R.)