1. Dual Graphs on Surfaces;

 after Jack Edmonds: On the Surface Duality of Linear Graphs,
J. Res. Natl. Bur. Stand. 69B (1965) 121-123.

2. Why Chess and Backgammon can be solved in pure positional uniformly optimal strategies.

3. Games of no  return;

 after  A.S. Fraenkel, E.R. Scheinerman and D.Ullman:
Undirected edge geography,
Theoretical Computer Science, 112 (1993) 371-381.

 4. On graphs whose maximal cliques and stable sets intersect;

 after  Xiaotie Deng, Guojun Li, Wenan Zang:
Proof of Chvátal's conjecture on maximal stable sets and maximal cliques in graphs;
J. Comb. Theory, Ser. B 91(2) (2004) 301-325.

 5. Metric and ultrametric spaces of resistances;

before D.J. Klein and  M.J. Randic,
J. Math. Chem., Resistance distance, 12 (1993) 81-95.