@article{ARM_1985__21_4_a4,
     author = {Majcher, Zofia},
     title = {Matrices representable by directed graphs},
     journal = {Archivum mathematicum},
     pages = {205--218},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1985},
     mrnumber = {833133},
     zbl = {0615.05043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1985__21_4_a4/}
}