1. Graph theory and probability;Erdös;Canad. J. Math.,1959
2. P. Erdös, P. Frankl and Z. Füredi, Families of finite sets in which no set is covered by the union of r others, Israel J. Math., to appear.
3. On chromatic number of graphs and set-systems;Erdös;Acta Math. Acad. Sci. Hung.,1966
4. On chromatic number of infinite graphs;Erdös,1968
5. Enumeration of intersecting families;Erdös;Discrete Math.,1984