1. A variation on a theorem of Galvin and Hajnal;Jech;Bull. London Math. Soc.,1993
2. M. Kojman, The A, B,C of pcf, http://arxiv.org, 1995.
3. Advances in cardinal arithmetic;S. Shelah,1993
4. Cardinal Arithmetic;Shelah,1994
5. The pcf theorem revisited;Shelah,1997