摘要: … to the special case of least squares approximation by circles, ellipses and rotated ellipses, and … The origin of the least squares problem is explained in [20]: the essentials of that analysis …
Helmuth Späth, Orthogonal least squares fitting by conic sectionsProceedings of the second international workshop on Recent advances in total least squares techniques and errors-in-variables modeling. pp. 259- 264 ,(1997)