Gasper, G. "-Extensions of Barnes', Cauchy's, and Euler's Beta Integrals." In Topics in Mathematical Analysis (Ed. Yh. M. Rassias). London: World Scientific, pp. 194-314, 1989.Whittaker, E. T. and Watson, G. N. A Course in Modern Analysis, 4th ed. Cambridge, England: Cambridge University Press, 1990.