Bateman, H. "The -Function, a Particular Case of the Confluent Hypergeometric
Function." Trans. Amer. Math. Soc.33, 817-831, 1931.Koepf,
W. Hypergeometric
Summation: An Algorithmic Approach to Summation and Special Function Identities.
Braunschweig, Germany: Vieweg, p. 179, 1998.Koepf, W. and Schmersau,
D. "Bounded Nonvanishing Functions are Bateman Functions." Complex Variables25,
237-259, 1994.