Affiliation: | 1.Bielefeld University, Bielefeld, D-33501, Germany ;2.Trapeznikov Institute of Control Sciences of Russian Academy of Sciences, Moscow, 117997, Russia ;3.University of Warmia and Mazury in Olsztyn, Olsztyn, 10-719, Poland ;4.Institute of Mathematics, National Autonomous University of Mexico, Oaxaca de Juárez, Oaxaca, 68120, Mexico ; |