1. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables;Abramowitz,1972
2. Another elementary proof of Euler's formula for ζ(2n);Apostol;Amer. Math. Monthly,1973
3. Introduction to Analytic Number Theory;Apostol,1976
4. Euler and the zeta function;Ayoub;Amer. Math. Monthly,1974
5. Elementary evaluation of ζ(2n);Berndt;Math. Mag.,1975