S. J. Ahn, W. Rauh , (1999) Geometric ？tting of line, plane, circle, sphere,and ellipse,

S. J. Ahn, , (2000) Best-？t of implicit surfaces and plane curves, Vanderbilt Univ Press

(2001) Least-squares orthogonal distances ？tting of circle, sphere, ellipse, hyperbola,and parabola,

Gander, (1994) tting of circles and ellipses,

M. Gulliksson, , (2001) Implicit surface ？tting using directionalconstraints,

I. Seufer , (1999) Least squares ？tting of conic sections with type identi？cation byNURBS of degree two.,

(1967) The damped taylor's series method for minimizing a sum of squares and forsolving systems of nonlinear equations Collected Algorithms of the ACM,

Boston, (1992) Mathematical algorithms for linear regression Translated and revised fromthe 1987 German original by the author, Academic Press Inc

(1996) Least-squares ？tting by circles,

(1996) Orthogonal squared distance ¯tting with parabolas,

(1997) Least-squares ？tting of ellipses and hyperbolas,

(19961997) Orthogonal least squares ？tting by conic sections. Recent advances in totalleast squares techniques and errors-in-variables modeling,

(1998) Least-square ？tting with spheres,

(1999) Estimating the parameters of an ellipse when angular di？？erences are known,

D. A. Turner,, (1999) An algorithm for ？ tting anellipsoid to data to be found in www,