@article{CLCQ12TVCG,
 author = {Juan Cao and Xin Li and Zhonggui Chen and Hong Qin},
 title = {Spherical DCB-Spline Surfaces with Hierarchical and Adaptive Knot Insertion},
 journal ={IEEE Transactions on Visualization and Computer Graphics},
 volume = {18},
 number = {8},
 year = {2012},
 pages = {1290-1303}
}