Bailey, W. N. 广义超几何级数。 剑桥,英格兰:剑桥大学出版社,1935年。Edwards, D. "An Expansion in Factorials Similar to Vandermonde's Theorem, and Applications." Messenger Math.52, 129-136, 1923.Orr, W. M. "Theorems Relating to the Product of Two Hypergeometric Series." Trans. Cambridge Philos. Soc.17, 1-15, 1899.Watson, G. N. "The Theorems of Clausen and Cayley on Products of Hypergeometric Functions." Proc. London Math. Soc.22, 163-170, 1924.Whipple, F. J. W. "Algebraic Proofs of the Theorems of Cayley and Orr Concerning the Products of Certain Hypergeometric Series." J. London Math. Soc.2, 85-90, 1927.Whipple, F. J. W. "On a Formula Implied in Orr's Theorems Concerning the Products of Hypergeometric Series." J. London Math. Soc.4, 48-50, 1929.