1. On property B(s);Abbott;Ars Combin.,1979
2. On a combinatorial problem of Erdös and Hajnal;Abbott;Canad. Math. Bull.,1964
3. On 3-chromatic graphs;Beck;Discrete Math.,1978
4. Hypergraphs and Ramseyian theorems;Chvátal,1970
5. On a combinatorial problem;Erdös;Nordisk Mat. Tidskr.,1963