@article{GDZPPN001182404,
title = {A Direct Method for Sparse Least Squares Problems with Lower and Upper Bounds.},
journal = {Numerische Mathematik},
volume = {56},
year = {1989},
pages = {19-32},
zbl = {0659.65039},
url = {http://dml.mathdoc.fr/item/GDZPPN001182404}
}
Björck, Ake. A Direct Method for Sparse Least Squares Problems with Lower and Upper Bounds.. Numerische Mathematik, Tome 56 (1989) pp. 19-32. http://gdmltest.u-ga.fr/item/GDZPPN001182404/