Siva Anantharaman Paliath Narendran Michaël Rusinowitch Unification Modulo ACU I Plus Homomorphisms/Distributivity. 442-457 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2741&spage=442 2003 conf/cade/2003 CADE db/conf/cade/cade2003.html#AnantharamanNR03