@article{ELA_1998__4__a4,
     author = {Lee, Gwang-Yeon and Shader, Bryan L.},
     title = {Sign-consistency and solvability of constrained linear systems},
     journal = {The electronic journal of linear algebra},
     pages = {1--18},
     publisher = {mathdoc},
     volume = {4},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_1998__4__a4/}
}