Carlos Andradas Tomás Recio J. Rafael Sendra Luis Felipe Tabera On the simplification of the coefficients of a parametrization. 192-210 2009 44 J. Symb. Comput. 2 http://dx.doi.org/10.1016/j.jsc.2008.09.001 db/journals/jsc/jsc44.html#AndradasRST09