@article{01306002,
title = {Preconditioners for least squares problems by LU factorization.},
journal = {ETNA. Electronic Transactions on Numerical Analysis [electronic only]},
volume = {8},
year = {1999},
pages = {26-35},
zbl = {0924.65034},
language = {en},
url = {http://dml.mathdoc.fr/item/01306002}
}
Björck, Åke; Yuan, J.Y. Preconditioners for least squares problems by LU factorization.. ETNA. Electronic Transactions on Numerical Analysis [electronic only], Tome 8 (1999) pp. 26-35. http://gdmltest.u-ga.fr/item/01306002/