By Karamzin D.Y.   de Oliveira V.A.   Pereira F.L.   Silva G.N.   in ESAIM: Control, Optimisation and Calculus of Variations

ISSN:1292-8119|21|3|857-875

Edp Sciences‎(2015)‎

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By Pereira F. L.   Silva G. N.   in Differential Equations

ISSN:0012-2661|40|8|1122-1130

MAIK Nauka/Interperiodica‎(2004)‎

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