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David Moskovitz, Certain Irregular Non-Homogeneous Linear Difference Equations, American Journal of Mathematics, Vol. 55, No. 1 (1933), pp. 525-552 ...
Factorization of Operators of Second Order Linear Homogeneous Ordinary Differential Equations Donn C. Sandell and F. Max Stein The Two-Year College Mathematics Journal , pp. 132-141 (10 pages) ...