Deok-Soo Kim Jeongyeon Seo Donguk Kim Youngsong Cho Joonghyun Ryu The beta-Shape and beta-Complex for Analysis of Molecular Structures. 47-66 2008 Generalized Voronoi Diagram http://dx.doi.org/10.1007/978-3-540-85126-4_3 series/sci/2008-158 db/series/sci/sci158.html#KimSKCR08