9Shuangmin Chen,Shiqing Xin,Ying He,Guojin Wang School of Computer Engineering,Nanyang Technological University,Singapore 639798,State Key Lab of CAD&CG,Zhejiang University,Hangzhou 310054,China.The Closest and Farthest Points to an Affine Ellipse or Ellipsoid[J].Tsinghua Science and Technology,2012,17(4):481-484.