Okhlobystina, Anastasiya B., Academic Music College attached to the Moscow State P.I. Tchaikovsky Conservatoire, Moscow
Okuneva, Ekaterina G., Petrozavodsk State A. K. Glazunov Conservatory, Petrozavodsk, Russia
Osipenko, Elena A., Music College of the Institute of Arts of the Khakass State N. F Katanov University Abakan, Republic of Khakassia, Russia
Osipenko, Olesya A., Siberian State D. Hvorostovsky Institute of Arts, Krasnoyarsk, Russia
Osipenko, Olesya A. , Dmitry Khvorostovsky Siberian State Institute of Arts, Krasnoyarsk, Russia

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