1. History of the Theory of Numbers, vol. 1;Dickson,1919
2. Solution to “Problem 10331”;Everling;Amer. Math. Monthly,1996
3. Concrete Mathematics: A Foundation for Computer Science;Graham,1989
4. Explicit bounds on exponential sums and the scarcity of squarefree binomial coefficients;Granville;Mathematika,1996
5. Unsolved Problems in Number Theory;Guy,2004