@article{GDZPPN001176366, title = {Least Squares with a Quadratic Constraint.}, journal = {Numerische Mathematik}, volume = {35}, year = {1980}, pages = {291-308}, zbl = {0437.65031}, url = {http://dml.mathdoc.fr/item/GDZPPN001176366} }
Gander, W. Least Squares with a Quadratic Constraint.. Numerische Mathematik, Tome 35 (1980) pp. 291-308. http://gdmltest.u-ga.fr/item/GDZPPN001176366/