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Institute of Applied Mathematics and Mechanics Faculty of Mathematics, Informatics and Mechanics University of Warsaw, ul. Banacha 2, PL-02-097 Warsaw, POLAND tel. (48-22)-554-44-65; fax (48-22)-554-43-00 Orcid number 0000-0001-5194-3816 e-mail: lachowic (at) mimuw.edu.pl |