1. H. Exton, (1976), Multiple Hypergeometric Functions and Applications, John Wiley and Sons, Halsted Press, New York.
2. H. Exton, (1982), Hypergeometric functions of three variables, J. Indian Acad. Maths. 4, 113–119.
3. H. Exton, (1982), Reducible double hypergeometric functions and associated integrals, An Fac. Ci. Univ. Porto, 63, 137–143.
4. J. L. Lavoie, F. Grondin and A. K. Rathie, (1996), Generalizations of Whipple’s theorem on the sum of a 3F2 Journal of Computational and Applied Mathematics, 72, 293–300. 10.1016/0377-0427(95)00279-0.
5. E. D. Rainville, (1960), Special Functions, The Macmillan Company, New York.