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Frequently a domain of discourse can be described as a hierarchical structure. Then instead of using one place predicates to describe the type of a term one can associate types directly, and let the unification procedure take advantage of it. This prunes the search space without the use of the Cut operator. © 1986, ACM. All rights reserved.
Marcio Buss, Daniel Brand, et al.
Science of Computer Programming
Daniel Brand, Vijay S. Iyengar
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
William C. Carter, William H. Joyner, et al.
DAC 1979
Daniel Brand, Tsutomu Sasao
IEEE TC