Hubert Comon Paliath Narendran Robert Nieuwenhuis Michaël Rusinowitch Deciding the confluence of ordered term rewrite systems. 33-55 2003 4 ACM Trans. Comput. Log. 1 http://doi.acm.org/10.1145/601775.601777 db/journals/tocl/tocl4.html#ComonNNR03