Authors
Gulbanu A. Kaptagay
Kazakh National Women’s Teacher Training University, Almaty, Kazakhstan
Nazira A. Sandibaeva
Kazakh National Women’s Teacher Training University, Almaty, Kazakhstan
Talgat M. Inerbaev
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
L. N. Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan
Yuri A. Mastrikov
Institute of Solid State Physics, University of Latvia, Latvia
Eugene A. Kotomin
Institute of Solid State Physics, University of Latvia, Latvia