Michael Canjar. Countable ultraproducts without CH. Annals of pure and applied logic, vol. 37 (1988), pp. 1–79. - R. Michael Canjar. Small filter forcing. The journal of symbolic logic, vol. 51 (1986), pp. 526–546.
Arnold W. Miller · Journal of Symbolic Logic · 1991
Michael Canjar. Countable ultraproducts without CH. Annals of pure and applied logic, vol. 37 (1988), pp. 1–79. - R. Michael Canjar. Small filter forcing. The journal of symbolic logic, vol. 51 (1986), pp. 526–546. - Volume 56 Issue 1