Modern Methods in Operator Theory and Harmonic Analysis OTHA 2018, Rostov-on-Don, Russia, April 22-27, Selected, Revised and Extended Contributions - Karapetyants, Alexey; Karapetyants, Alexey; Kravchenko, Vladislav; Kravchenko, Vladislav; Liflyand, Elijah; Liflyand, Elijah (Springer International Publishing : Imprint: Springer, 2019)