Affiliation: | (1) Institute of Applied Mathematics and Mechanics, NAS of Ukraine, ul. Roza Luxemburg 74, 83114 Donetsk, Ukraine;(2) Department of Mathematics, Technion - Israel Institute of Technology, 32000 Haifa, Israel;(3) Holon Academic Institute of Technology, 52 Golomb St., P.O.Box 305, 58102 Holon, Israel |