1. Solution of a problem of P. Erdös;Conway,1969
2. Problems and results in additive number theory;Erdös,1955
3. Mathematical Games: On the fine art of putting players, pills and pigeons into their proper pigeonholes;Gardner;Sci. Amer.,1980
4. Table of Integrals, Series, and Products;Gradshteyn,1980
5. International Mathematical Olympiads;Greitzer,1978