Seiki Akama Kazumi Nakamatsu Jair Minoro Abe Constructive Logic and the Sorites Paradox. 285-292 2008 New Directions in Intelligent Interactive Multimedia http://dx.doi.org/10.1007/978-3-540-68127-4_30 series/sci/2008-142 db/series/sci/sci142.html#AkamaNA08