Rafael Chanin Mônica Corrêa Paulo Fernandes Afonso Sales Roque Scheer Avelino F. Zorzo 131-149 2006 151 Electr. Notes Theor. Comput. Sci. 3 http://dx.doi.org/10.1016/j.entcs.2006.03.016 db/journals/entcs/entcs151.html#ChaninCFSSZ06