http://arxiv.org/abs/0804.1503

wget http://www.uni-math.gwdg.de/bothmer/rationality/ScorzaOcta.m2
wget http://www.uni-math.gwdg.de/bothmer/rationality/plausibility.m2
wget http://www.uni-math.gwdg.de/bothmer/rationality/proof.m2
