Abramowitz, Milton; Stegun, Irene Ann, eds. (1983) [June 1964]. "Chapter 8". Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Applied Mathematics Series. 55. Washington D.C.; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications. p. 332. ISBN 978-0-486-61272-0. LCCN64-60036 & 65-12253. MR0167642.
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Abramowitz, Milton; Stegun, Irene Ann, eds. (1983) [June 1964]. "Chapter 8". Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Applied Mathematics Series. 55. Washington D.C.; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications. p. 332. ISBN 978-0-486-61272-0. LCCN64-60036 & 65-12253. MR0167642.