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I. V. Semenyshyna

On existence of a smooth bounded semiinvariant manifold for a degenerate nonlinear system of difference equations in the space $\mathfrak{m}$: A. M. Samoilenko, Y. V. Teplinsky, and I. V. Semenyshyna; Volume 6, No.3, pp. 378-400; Link PDF
On finding periodic solutions of second order difference equations in a Banach spase: Y. V. Teplinsky and I. V. Semenyshyna; Volume 4, No.3, pp. 405-421; Link PDF
On periodic solutions of difference equations in infinite-dimensional spaces: Y. V. Teplinsky and I. V. Semenyshyna; Volume 3, No.3, pp. 414-430; Link