Entire solutions of one linear implicit differential-difference equation in Banach spaces von S. L. Hefter, O. L. Piven

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Linear differential equation with inhomogeneity in the form of a formal power series over a ring with non-Archimedean valuation von S. L. Hefter, A. B. Honcharuk

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Infinite order differential operators in the module of formal generalized functions and in a ring of formal power series von S. L. Hefter, O. L. Piven

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