1. C. J. Ash, ℵ0-categorical theories, to appear.
2. Models and Ultraproducts;Bell,1969
3. The elementary theory of Abelian groups;Eklof;Ann. Math. Logic,1972
4. A characterization of theories with isomorphic denumerable models;Engeler;Amer. Math. Soc. Notices,1959
5. A problem in categoricity;Glassmire;Amer. Math. Soc. Notices,1970