Boaz Ben-Moshe Binay K. Bhattacharya Sandip Das Daya Ram Gaur Qiaosheng Shi Computing a planar widest empty alpha-siphon in o(n<sup>3</sup>) time. 33-36 2007 conf/cccg/2007 CCCG db/conf/cccg/cccg2007.html#Ben-MosheBDGS07