@article{05346593,
title = {Linear least squares with quadratic constraints.},
journal = {Divulgaciones Matem\'aticas},
volume = {15},
year = {2007},
pages = {161-177},
zbl = {1149.65030},
language = {en},
url = {http://dml.mathdoc.fr/item/05346593}
}
Castillo, Zenaida. Linear least squares with quadratic constraints.. Divulgaciones Matemáticas, Tome 15 (2007) pp. 161-177. http://gdmltest.u-ga.fr/item/05346593/