Joon C. Park Hayong Shin Byoung Kyu Choi Elliptic Gabriel graph for finding neighbors in a point set and its application to normal vector estimation. 619-626 2006 38 Computer-Aided Design 6 http://dx.doi.org/10.1016/j.cad.2006.02.008 db/journals/cad/cad38.html#ParkSC06