Krzysztof R. Apt, Alessandro Pellegrini. Why the Occur-Check is Not a Problem. In Maurice Bruynooghe, Martin Wirsing, editors, Programming Language Implementation and Logic Programming, 4th International Symposium, PLILP 92, Leuven, Belgium, August 26-28, 1992, Proceedings. Volume 631 of Lecture Notes in Computer Science, pages 69-86, Springer, 1992.
Abstract is missing.