1. Set theory and the continuum hypothesis;Cohen,1966
2. Consistency proof for the generalized continum hypothesis;Gödel;Proc. Nat. Acad. Sci. U.S.A.,1939
3. Some permutation submodels of the model Δ;Hajek;Bull. Acad. Polonaise Sci.,1966
4. On Θ model of the set theory;Jech;Bull. Acad. Polonaise Sci.,1966
5. Applications of the Θ model;Jech;Bull. Acad. Polonaise Sci.,1966