By Borne P.   Cruz-Hernández C.   Dzhalalov E.   Freedman H.   Gaishun I.   Izobov N.   Radzishevskii B.   Samoilenko A.   Stavrulakis I.   Sun Zhen   in Differential Equations

ISSN:0012-2661|47|3|305-306

MAIK Nauka/Interperiodica‎(2011)‎

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