TY - JOUR AU - Miller, Arnold W. IS - 1 JA - Journal of Symbolic Logic PY - 1991 TI - Michael Canjar. Countable ultraproducts without CH. Annals of pure and applied logic, vol. 37 , pp. 1–79. - R. Michael Canjar. Small filter forcing. The journal of symbolic logic, vol. 51 , pp. 526–546 VL - 56 ER -