@article{NUMA_1980__35_186295,
     author = {D.J. Hartfiel},
     title = {Concerning the {Solution} {Set} of {Ax} = b where {P<} {A} < {Q} and p < b < q.},
     journal = {Numerische Mathematik},
     pages = {355--360},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__35_186295/}
}