Efremova N.Yu. 
Derzhavin Tambov State University
Tambov, Russian Federation
Efremova N.Yu. --- Cand. Sc. (Phys.-Math.), Assoc. Professor, Department of Theoretical and Experimental Physics, Institute of Mathematics, Physics and Information Technology, Derzhavin Tambov State University (Internatsionalnaya ul. 33, Tambov, 392000 Russian Federation).
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