@Article{BierToinTuyt91,
author = {Michel Bierlaire and Philippe L. Toint and Daniel Tuyttens },
title = {On iterative algorithms for linear least squares problems with bound constraints},
journal = {Linear Algebra and its Applications},
volume = {143},
number = {1},
pages = {111-143},
doi = {10.1016/0024-3795(91)90009-L},
year = {1991}
}