1. Some Theorems on Abstract Graphs
2. and , Monochromatic paths in infinite graphs. Colloquia Mathematica Societatis Janos Bolyai, 37, Finite and Infinite Sets, Eger, Hungary (1981) 359–369.
3. Some universal graphs
4. Universal graphs without large bipartite subgraphs
5. and , Universal elements and the complexity of certain classes of infinite graphs. To appear.