Institution: | (1) Institute of Mathematics and Mechanics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 16, Ekaterinburg, 620219, Russia;(2) Xuzhou Normal Univ., Xuzhou, 221116, P.R. China;(3) Institute of Mathematics and Mechanics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 16, Ekaterinburg, 620219, Russia |