By Belan E. P.   in Differential Equations

ISSN:0012-2661|40|5|692-702

MAIK Nauka/Interperiodica‎(2004)‎

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By Samoilenko A. M.   Belan E. P.   in Journal of Dynamics and Differential Equations

ISSN:1040-7294|15|2-3|305-325

Springer Publishing Company ‎(2003)‎

Access to resources Favorite 3.4230597