1. Model Theory;Chang,1977
2. Eine Bemerkung über die multiplikative Gruppe eines Körpers;Cohn;Arch. Math.,1962
3. Representation Theory of Finite Groups and Associative Algebras;Curtis,1962
4. Model-completions and modules;Eklof;Ann. Math. Logic,1971
5. First-order logic and its extensions;Flum,1974