1. Applied Combinatorial Mathematics;Beckenbach,1964
2. On Finite and Countable Rigid Graphs and Tournaments;Chvátal;Comment. Math. Univ. Carolinae,1965
3. Asymmetric Graphs;Erdös;Acta Math. Acad. Sci. Hungar.,1963
4. Herstellung von Graphen mit vorgegebener abstrakter Gruppe;Frucht;Compositio Math.,1938
5. The Number of Homeomorphically Irreducible Trees, and Other Species;Harary;Acta Math.,1959