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Journal of Mathematical Sciences (United States). Springer New York LLC. Vol. 153. 2008. P. 710-725

Journal of Mathematical Analysis and Applications. Academic Press Inc.. Vol. 328. 2007. P. 1188-1195

Regular and Chaotic Dynamics. Vol. 11. 2006. P. 475-481

Electronic Journal of Differential Equations. Vol. 2005. 2005.