Automorphisms of Models of True Arithmetic: More on Subgroups which Extend to a Maximal One Uniquely.

Henryk Kotlarski Bozena Piekart Automorphisms of Models of True Arithmetic: More on Subgroups which Extend to a Maximal One Uniquely. 111-120 2000 46 Math. Log. Q. 1 http://dx.doi.org/10.1002/(SICI)1521-3870(200001)46:1<111::AID-MALQ111>3.0.CO;2-E db/journals/mlq/mlq46.html#KotlarskiP00