1. Partially playful universes;Becker, Howard,1978
2. The core model;Dodd, A.;Ann. Math. Logic,1981
3. Pure and Applied Mathematics;Jech, Thomas,1978
4. Introduction to 𝑄-theory;Kechris, Alexander S.,1983
5. Sets constructible from sequences of ultrafilters;Mitchell, William J.;J. Symbolic Logic,1974