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C. A. Grimm, Particular Solutions of Second Order Linear Differential Equations with Constant Coefficients, Mathematics Magazine, Vol. 32, No. 1 (Sep. - Oct., 1958 ...
Fundamental Solutions of Linear Partial Differential Equations with Constant Coefficients Depending on Parameters, American Journal of Mathematics, Vol. 84, No. 4 (Oct., 1962), pp. 561-577 ...