%0 Journal Article %A K.M. Brown %A J.E. jr. Dennis %T Derivative Free Analogues of the Levenberg-Marquardt and Gauss Algorithms for Nonlinear Least Squares Approximation. %J Numerische Mathematik %D 1971 %P 289-297 %V 18 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1971__18_132109/ %F NUMA_1971__18_132109