Horn clause computability. Tärnlund, S. BIT Numerical Mathematics, 17(2):215–226, Springer, 1977.
bibtex   
@article{tarnlund1977,
  title={Horn clause computability},
  author={T{\"a}rnlund, Sten-{\AA}ke},
  journal={BIT Numerical Mathematics},
  volume={17},
  number={2},
  pages={215--226},
  year={1977},
  publisher={Springer}
}

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