SEARCH Articles Figures Tables By conjugation By gradient methods Conjugate gradient Conjugate gradient methods Conjugate method Conjugation methods Gradient method Gradients inverse Inverse least squares Inverse least squares methods Inverse methods Inversion method Least-squared method Least-squares method Least-squares method nonlinear Nonlinear Conjugate Gradient Nonlinear least-squares inversion Nonlinear methods Square gradient method Squared Gradient Method The Least Squares Method The conjugate gradient method