Xianfeng Gu Ying He 0001 Miao Jin Feng Luo 0002 Hong Qin Shing-Tung Yau Manifold splines with a single extraordinary point. 676-690 2008 40 Computer-Aided Design 6 http://dx.doi.org/10.1016/j.cad.2008.01.008 db/journals/cad/cad40.html#GuHJLQY08