Development of the method for extraction of beryllium from genthelvite group of minerals under the conditions of processing of mineral raw materials - Ospanov, Khabibula; Mutanov, Galymkair; Arynov, B.; Kozhakhmetov, S.; Rybakova, V.; Ospanova, N.; Baiboldieva, A. (Chemical Bulletin of Kazakh National University, 2012)