Many-sorted unification.

Christoph Walther: Many-sorted unification. J. ACM 35(1): 1-17(1988)

@article{DBLP:journals/jacm/Walther88,
  author    = {Christoph Walther},
  title     = {Many-sorted unification},
  journal   = {J. ACM},
  volume    = {35},
  number    = {1},
  year      = {1988},
  pages     = {1-17},
  ee        = {db/journals/jacm/Walther88.html, http://doi.acm.org/10.1145/42267.45071},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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