Affiliation: | 1. École Polytechnique Fédérale de Lausanne (EPFL), Institut de Mathématiques B (IMB), CH-1015 Lausanne, Switzerland;2. IKC5 Ltd., 5, Krasnogvardeyskaya str., office 2, Kyiv 02094, Ukraine;3. Institut of Mathematics, Silesian University of Technology, Ul. Kaszubska, 23, 44-100 Gliwice, Poland |