Authors
Nikolai P. Osmolovskii
Systems Research Institute, Polish Academy of Sciences, Warszawa, Poland
Meizhi Qian
Systems Research Institute, Polish Academy of Sciences, Warszawa, Poland
School of Mathematical Sciences, East China Normal University, Shanghai, China
Jan Sokołowski
Systems Research Institute, Polish Academy of Sciences, Warszawa, Poland
InstitutÉlie Cartan de Lorraine, UMR 7502, Université de Lorraine, France