@article{NUMA_1977__28_132487,
     author = {V. Klee and P. van den Driessche},
     title = {Linear {Algorithms} for {Testing} the {Sign} {Stability} of a {Matrix} and for {Finding} {Z-Maximum} {Matchings} in {Acyclic} {Graphs.}},
     journal = {Numerische Mathematik},
     pages = {273--286},
     publisher = {mathdoc},
     volume = {28},
     year = {1977},
     zbl = {0348.65032},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1977__28_132487/}
}