1. Roots and Canonical Forms for Circulant Matrices;Ablow;Trans. Amer. Math. Soc.,1963
2. E. Dauber and F. Harary, On Point-Symmetric and Line-Symmetric Graphs, to appear.
3. Pólya's Theory of Counting;de Bruijn,1964
4. Combinatorial Problems in Graphical Enumeration;Harary,1964