1. Problem 5328;Conway;Am. Math. Monthly,1965
2. Tiling the plane with triangles (Appendix B), Research Paper # 150;Eggleton;Dept. of Math., Stat. & Comp. Sci., Univ. of Calgary,1972
3. Regular Figures;Fejes Tóth,1964
4. Solution to problem 5328;Kay;Am. Math. Monthly,1966
5. On paving the plane;Kershner;Am. Math. Monthly,1968