1. Generalized Eisenstein series and modified Dedekind sums;Berndt;J. Reine Angew. Math.,1974
2. Irrationality of π2, periods of an elliptic curve and Γ1(5);Beukers,1983
3. Some congruences for the Apéry numbers;Beukers;J. Number Theory,1985
4. Another congruence for the Apéry numbers;Beukers;J. Number Theory,1987
5. Irrationality proofs using modular forms;Beukers;Soc. Math. France, Astérisque,1987