@article{AM2_1969__2_182318,
     author = {A.L. DULMAGE and N.S. MENDELSOHN},
     title = {Some {Graphical} {Properties} of {Matrices} with {Non-Negative} {Entries} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {134--136},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182318/}
}