1. “Complexity of Matching Problems” Rewriting Techniques and Applications;Bananev,1985
2. Unification in Datastructure Multisets;Büttner;Journal of Automated Reasoning,1986
3. Associative-Commutative Unification;Fages;Journal of Symbolic Computation,1987
4. An Algebraic Approach to Unification Under Associativity and Communtativity;Fortenbacher,1985
5. Ueber die Auflösung linearer Gleichungen mit reelen Coefficienten;Gordan;Mathermatische Annalen VI Band, 1 Heft,1873