References
D. G. Birkhoff and W. J. Trjitzinsky, “Analytic Theory of Singular Difference Equations,” Acta Math. 60(1), 1–89 (1933).
D.G. Birkhoff, “Formal Theory of Irregular Linear Difference Equations,” ActaMath. 54(1), 205–246 (1930).
D. G. Birkhoff, “General Theory of Linear Difference Equations,” Trans. Amer. Math. Soc. 12(2), 243–284 (1911).
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Original Russian Text © D.N. Tulyakov, 2007, published in Sovremennye Problemy Matematiki, 2007, Vol. 9, pp. 45–53.
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Tulyakov, D.N. A procedure for finding asymptotic expansions for solutions of difference equations. Proc. Steklov Inst. Math. 272 (Suppl 2), 162–167 (2011). https://doi.org/10.1134/S0081543811030114
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DOI: https://doi.org/10.1134/S0081543811030114