1. A Combinatorial Problem;Guy;Nabla (Bull. Malayan Math. Soc.),1960
2. The Crossing Number of the Complete Graph;Guy;Calgary Research Paper #8,1967
3. The Toroidal Crossing Number of the Complete Graph;Guy;J. Combinatorial Theory,1968
4. The Toroidal Crossing Number of the Complete Graph;Guy;Calgary Research Paper #18,1967