1. Models of axiomatic theories admitting automorphisms;Ehrenfeucht;Fund. Math.,1956
2. Modelle der Arithmetik, Infinitistic Methods;MacDowell,1959
3. Results concerning models of Peano's arithmetic, Abstract 65T-195;Gaifman;Am. Math. Soc. Notices,1965
4. Rigid models, Abstract;Ehrenfeucht;J. Symbolic Logic,1962
5. H. Gaifman, Structure of models of Peano's arithmetic, in preparation