Pontriagin, L. S Obyknovennye differentsial'nye uravneniia L. S. Pontriagin - a 5-a ed - Moskva "Nauka" Gl. red. fiz. - mat. lit 1982 - 331 p ill 22 cm Cuprinde index Scriere chirilica Subjects--Topical Terms: Ecuatii diferentiale Dewey Class. No.: 517.9