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N. A. Marchuk

About $C^\varrho$ -smootness of an invariant torus of a countable system of difference equations defined on an $m$ -dimensional torus: Y. V. Teplinsky and N. A. Marchuk; Volume 5, No.2, pp. 251-265; Link PDF
On Frechet differentiability of invariant torus for nonlinear countable system of difference equations defined on an infinite-dimensional torus and containing deviations of the discrete argument: Y. V. Teplinsky and N. A. Marchuk; Volume 6, No.2, pp. 260-278; Link PDF
On Continuity of the Invariant Torus for Countable System of Difference Equations Dependent on Parameters: N. A. Marchuk; Volume 4, No.3, pp. 316-325; Link PDF