Carlos D'Andrea Hoon Hong Teresa Krick Ágnes Szántó An elementary proof of Sylvester's double sums for subresultants. 290-297 2007 42 J. Symb. Comput. 3 http://dx.doi.org/10.1016/j.jsc.2006.09.003 db/journals/jsc/jsc42.html#DAndreaHKS07