Hans Zantema Alfons Geser A Complete Characterization of Termination of 0<sup>p</sup> 1<sup>q</sup>-> 1<sup>r</sup> 0<sup>s</sup>. 1-25 2000 11 Appl. Algebra Eng. Commun. Comput. 1 http://link.springer.de/link/service/journals/00200/bibs/0011001/00110001.htm db/journals/aaecc/aaecc11.html#ZantemaG00