Axiomatizable Theories with Few Axiomatizable Extensions

@article{Martin1970AxiomatizableTW,
  title={Axiomatizable Theories with Few Axiomatizable Extensions},
  author={Donald A. Martin and Marian Boykan Pour-El},
  journal={J. Symb. Log.},
  year={1970},
  volume={35},
  pages={205-209}
}