Cottam, RonRonCottamRanson, WillyWillyRansonVounckx, RogerRogerVounckx2021-10-222021-10-222014https://imec-publications.be/handle/20.500.12860/23686System duality: birational hierachyProceedings paperhttp://journals.isss.org/index.php/proceedings58th/article/view/2391