Length of sumsin a Minkowski space. In: Pach J, editor. Towards a Theory of Geometric Graphs. Vol 342. AMS Bookstore; 2004. p. 113-8. (Contemporary mathematics; vol 342).
On the maximal number of certain subgraphs in K_r-free graphs. Graphs and Combinatorics. 1991;7(1):31-7.
Lokalno Gamiltonovy grafy. Mathematicheskie Zametki. 1989;45(1):36-42.