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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 ...
Michael F. Singer, Liouvillian Solutions of n-th Order Homogeneous Linear Differential Equations, American Journal of Mathematics, Vol. 103, No. 4 (Aug., 1981), pp ...