The Gödel incompleteness theorem and decidability over a ring. Blum, L. & Smale, S. In Hirsch, M. W., Marsden, J. E., & Shub, M., editors, From Topology to Computation: Proceedings of the Smalefest, pages 321–339, New York, 1993. Springer.
bibtex   
@INPROCEEDINGS{BS93,
  author = {Blum, Lenore and Smale, Steve},
  title = {The {G}\"{o}del incompleteness theorem and decidability over a ring},
  booktitle = {From Topology to Computation: Proceedings of the Smalefest},
  year = {1993},
  editor = {Hirsch, Morris W. and Marsden, Jerrold E. and Shub, Michael},
  pages = {321--339},
  address = {New York},
  publisher = {Springer},
  file = {BS93.pdf:BS93.pdf:PDF}
}

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