On the singular graph and the Weyr characteristic of an M-matrix.
Aequationes mathematicae, Tome 17 (1978), pp. 208-234.

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@article{AM2_1978__17_136741,
     author = {Hans Schneider and D.J. Richman},
     title = {On the singular graph and the {Weyr} characteristic of an {M-matrix.}},
     journal = {Aequationes mathematicae},
     pages = {208--234},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0379.15009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136741/}
}
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%A D.J. Richman
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Hans Schneider; D.J. Richman. On the singular graph and the Weyr characteristic of an M-matrix.. Aequationes mathematicae, Tome 17 (1978), pp. 208-234. http://geodesic.mathdoc.fr/item/AM2_1978__17_136741/