AN EXTENSION OF THE TRIPLE HYPERGEOMETRIC SERIES BY EXTON
Seung-Woo Lee, Yong-Sup Kim · Honam Mathematical Journal · 2010
The aim of this paper is to extend a number of transformation formulas for the four $X_4$ , $X_5$ , $X_7$ , and $X_8$ among twenty triple hypergeometric series $X_1$ to $X_{20}$ introduced earlier by Exton. The results are derived from the generalized Kummer's theorem and Dixon's theorem obtained earlier by Lavoie et al..