@article{GDZPPN001181270, title = {A Generalized Conjugate Gradient, Least Square Method.}, journal = {Numerische Mathematik}, volume = {55}, year = {1987}, pages = {209-228}, zbl = {0596.65014}, url = {http://dml.mathdoc.fr/item/GDZPPN001181270} }
Axelsson, O. A Generalized Conjugate Gradient, Least Square Method.. Numerische Mathematik, Tome 55 (1987) pp. 209-228. http://gdmltest.u-ga.fr/item/GDZPPN001181270/