1. Symmetry of iteration digraphs;Carlip;Czechoslovak Math. J.,2008
2. Domination in Cartesian products: Vizing’s conjecture;Hartnell,1998
3. 17 Lectures on Fermat Numbers: From Number Theory to Geometry;Křížek,2001
4. Digraphs from powers modulo p;Lucheta;Fibonacci Quart.,1996
5. An Introduction to the Theory of Numbers;Niven,1991