1. Aczel, J., Lectures on Functional Equations and Their Applications. New York: Academic Press 1966.
2. Beyer, W. A., & L. Heller, Analytic continuation of Laplace transforms by means of asymptotic series. J. Math. Phys. 8, 1004?1018 (1967).
3. Doetsch, G., Handbuch der Laplace-Transformation, vol. II. Basel: Birkhäuser 1955.
4. Erdelyi, A., Asymptotic Expansions. New York: Dover Publications, Inc. 1956.
5. Erdelyi, A., W. Magnus, F. Oberhettinger, & F. Tricomi, Bateman Manuscript Project. Table of Integral Transforms, Vol. 1. New York: McGraw-Hill Book Co. Inc. 1954a.