1. On sets of almost disjoint subsets of a set;Erdos;Acta Math. Acad. Sci. Hungar,1968
2. Eine Bemerkung zur Theorie der regressiven Funktionen;Fodor;Acta Sci. Math.,1956
3. Inequalities for cardinal powers;Galvin;Ann. of Math.,1975
4. M. Magidor and R. Solovay, to appear.
5. J. Silver, to appear in Proc. Internl. Congress of Mathematics, Vancouver.