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• [3] Guido Hoheisel, Lineare funktionale Differentialgleichungen, Math. Z. 14 (1922), no. 1, 35–98 (German). MR 1544541, https://doi.org/10.1007/BF01215892
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• [9] E. M. Wright, The linear difference-differential equation with constant coefficients, Proc. Roy. Soc. Edinburgh Sect. A 62 (1949), 387–393. MR 31639
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K. L. Cooke, The asymptotic behavior of the solutions of linear and nonlinear differential-difference equations, Trans. Amer. Math. Soc. vol. 75 (1953) pp. 80-105. MR 0060133 (15:629d)

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G. Doetsch, Theorie und Anwendung der Laplace-Transformation, New York, 1943. MR 0009225 (5:119f)

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A. A. Mirolyubov, Solution of differential-difference equations with linear coefficients, (Doklady) Akad. Nauk SSSR (N.S.) vol. 85 (1952) pp. 1209-1210 (Russian). MR 0050153 (14:285e)

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E. C. Titchmarsh, Theory of functions, Oxford, 1932.

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E. M. Wright, Linear difference-differential equations, Proc. Cambridge Philos. Soc. vol. 44 (1948) pp. 179-185. MR 0026230 (10:125c)

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E. M. Wright and B. G. Yates, The asymptotic expansion of a certain integral, Quart. J. Math. Oxford (2) vol. 1 (1950) pp. 41-53. MR 0034856 (11:653c)