Deepak Kapur G. Sivakumar Proving Associative-Communicative Termination Using RPO-Compatible Orderings. 39-61 http://link.springer.de/link/service/series/0558/bibs/1761/17610039.htm 1998 conf/ftp/1998 FTP (LNCS Selection) db/conf/ftp/ftp-lncs1998.html#KapurS98