@article{01209073,
title = {Sign-consistency and solvability of constrained linear systems.},
journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
volume = {4},
year = {1998},
pages = {1-18},
zbl = {0912.15004},
language = {en},
url = {http://dml.mathdoc.fr/item/01209073}
}
Lee, Gwang-Yeon; Shader, Bryan L. Sign-consistency and solvability of constrained linear systems.. ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 4 (1998) pp. 1-18. http://gdmltest.u-ga.fr/item/01209073/