1. Modular equations and approximations to π;Ramanujan;Quart. J. Pure Appl. Math.,1914
2. Generalized Hypergeometric Series;Bailey,1935
3. Rational functions certify combinatorial identities;Wilf;J. Amer. Math. Soc.,1990
4. Closed-form (pun intended!);Zeilberger;Contemp. Math.,1993
5. A=B;Petkovšek,1996