1. Disjoint refinement;Balcar,1989
2. On systems of almost disjoint sets;Balcar;Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys.,1972
3. Model Theory;Chang,1973
4. Bijectively related spaces. I. Manifolds;Doyle;Pacific J. Math.,1984
5. Model Theory;Hodges,1993