1. Blass, A.: Simple cardinal characteristics of the continuum. In: Set theory of the reals (Ramat Gan, 1991), vol 6 of Israel Math. Conf. Proc., pp. 63–90. Bar-Ilan University, Ramat Gan (1993)
2. Goldstern M., Shelah S.: Many simple cardinal invariants. Arch. Math. Logic 32(3), 203–221 (1993)
3. Kellner, J., Shelah, S.: Decisive creatures and large continuum. math.LO/0601083 to appear in J. Symbolic Logic