Xiquan Shi Tianjun Wang Piqiang Yu A practical construction of G1 smooth biquintic B-spline surfaces over arbitrary topology. 413-424 2004 36 Computer-Aided Design 5 http://dx.doi.org/10.1016/S0010-4485(03)00111-8 db/journals/cad/cad36.html#ShiWY04