@inproceedings{jianmin1995gc^n,
  title={GC^n continuity conditions for adjacent rational parametric surfaces },
  author={Jianmin Zheng, Guozhao Wang, and Youdong Liang},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160828193209572387498},
  booktitle={Computer Aided Geometric Design},
  volume={12},
  pages={111-129},
  year={1995},
}
             
            
                
Jianmin Zheng, Guozhao Wang, and Youdong Liang. GC^n continuity conditions for adjacent rational parametric surfaces . 1995. Vol. 12. In Computer Aided Geometric Design. pp.111-129. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160828193209572387498.