1. Graph Theory;Harary,1969
2. The number of trees in a graph. 1;Kelmans;Avtomat. i Telmeh.,1965
3. The number of trees in a graph. ll;Kelmans;Avtomat. i Telmeh.,1966
4. On properties of the characteristic polynomial of a graph;Kelmans,1967
5. A certain polynomial of a graph and graphs with an external number of trees;Kelmans;J. Combinatorial Theory Ser.,1974