International Scientific Conference on Modern Methods, Problems and Applications of Operator Theory and Harmonic Analysis, OTHA 2020, Rostov-on-Don, Russia, 26 - 30 April 2020, vol.357, pp.161-177
International Scientific Conference of Modern Methods and Problems of Operator Theory and Harmonic Analysis and Their Applications, OTHA 2018, Rostov-on-Don, Russia, 22 - 27 April 2018, vol.291, pp.35-49