Affiliation: | 19914. Kazan (Volga region) Federal University, Kremlevskaya ul. 18, Kazan, 420008, Republic of Tatarstan, Russia 29914. Kazan State Power-Engineering University, Krasnosel’-skaya ul. 51, Kazan, 420066, Republic of Tatarstan, Russia 39914. Open Corporation Joint-Stock Commercial Investment Bank Tatfondbank, ul. Chernyshevskogo 43/2, Kazan, 420111, Republic of Tatarstan, Russia
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