@article{GDZPPN001181300,
title = {On Condition Numbers and the Distance to the Nearest Ill-posed Problem.},
journal = {Numerische Mathematik},
volume = {55},
year = {1987},
pages = {251-290},
zbl = {0597.65036},
url = {http://dml.mathdoc.fr/item/GDZPPN001181300}
}
Demmel, James Weldon. On Condition Numbers and the Distance to the Nearest Ill-posed Problem.. Numerische Mathematik, Tome 55 (1987) pp. 251-290. http://gdmltest.u-ga.fr/item/GDZPPN001181300/