1. Reference data for radio engineers, (Howard W. Sams & Co., Ltd 1975), p. 42–46 ITT:
2. Abramowitz, M., Stegun, I.A., Handbook of mathematical tables, (Dover Publications, Inc., New York 1970)
3. Gradshteyn, I.A., and Ryzhik, I.W.: Table of integrals, series and products, (Academic Press, Inc. 1980)