1. The weak □* is really weaker than the full □;Ben-David, Shai;J. Symbolic Logic,1986
2. Squares, scales and stationary reflection;Cummings, James;J. Math. Log.,2001
3. Indexed squares;Cummings, James;Israel J. Math.,2002
4. Extender based forcings;Gitik, Moti;J. Symbolic Logic,1994
5. M. Gitik, Prikry Type Forcings, Handbook of Set Theory, eds. M. Foreman, A. Kanamori and M. Magidor,to appear. (www.math.tau.ac.il/ gitik)