Fasenmyer, Sister M. C. Some Generalized Hypergeometric Polynomials. Ph.D. thesis. University of Michigan, Nov. 1945.Fasenmyer, Sister M. C. "Some Generalized Hypergeometric Polynomials." Bull. Amer. Math. Soc.53, 806-812, 1947.Fasenmyer, Sister M. C. "A Note on Pure Recurrence Relations." Amer. Math. Monthly56, 14-17, 1949.Koepf, W. "Holonomic Recurrence Equations." Ch. 4 in Hypergeometric Summation: An Algorithmic Approach to Summation and Special Function Identities. Braunschweig, Germany: Vieweg, pp. 44-60, 1998.Petkovšek, M.; Wilf, H. S.; and Zeilberger, D. "Sister Celine's Method." Ch. 4 in A=B. Wellesley, MA: A K Peters, pp. 55-72, 1996. http://www.cis.upenn.edu/~wilf/AeqB.html.Rainville, E. D. Chs. 14 and 18 in Special Functions. New York: Chelsea, 1971.Verbaten, P. "The Automatic Construction of Pure Recurrence Relations." Proc. EUROSAM '74, ACM-SIGSAM Bull.8, 96-98, 1974.Wilf, H. S. and Zeilberger, D. "An Algorithmic Proof Theory for Hypergeometric (Ordinary and "") Multisum/Integral Identities." Invent. Math.108, 575-633, 1992.