1. F. Baader and T. Nipkow, Term rewriting and all that, Cambridge University Press, 2006.
2. L. Bachmair, N. Dershowitz and J. Hsiang, Orderings for equational proofs, In 1st IEEE Symp. on Logic in Computer Science, 346-357. IEEE Computer Society Press, 1986.
3. J. Corbin and M. Bidoit, A rehabilitation of Robinson's unification algorithm, In R. Pavon, editor, Information Processing 83, 909-914, North-Holland, 1983.
4. N. Dershowitz, L. Marcus and A. Tarlecki, Existence, uniqueness, and construction of rewrite systems, SIAM J. Computing 17 (1988), 629–639.
5. Ph. Dwinger and F. M. Yaqub, Generalized free products of Boolean algebras with an amalgamated subalgebra, Neder. Akad. Wetensch. Proc. Ser. A 66 = Indag. Math. 25(1963), 225–231.