Computable Functions and Semicomputable Sets on Many-Sorted Algebras. Tucker, J. & Zucker, J. In Abramsky, S., Gabbay, D., & Maibaum, T., editors, Handbook of Logic in Computer Science, Volume 5, pages 317–523, Oxford, 2000. Oxford University Press.
bibtex   
@INPROCEEDINGS{TZ00,
  author = {Tucker, J.V. and Zucker, J.I.},
  title = {Computable Functions and Semicomputable Sets on Many-Sorted Algebras},
  booktitle = {Handbook of Logic in Computer Science, Volume 5},
  year = {2000},
  editor = {Abramsky, S. and Gabbay, D.M. and Maibaum, T.S.E.},
  pages = {317--523},
  address = {Oxford},
  publisher = {Oxford University Press},
  keywords = {bib,cca}
}

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