@article{ARM_1991__27_3-4_a6,
     author = {Vetch\'y, Vladim{\'\i}r},
     title = {Metrically regular square of metrically regular bigraphs. {I}},
     journal = {Archivum mathematicum},
     pages = {183--197},
     publisher = {mathdoc},
     volume = {27},
     number = {3-4},
     year = {1991},
     mrnumber = {1189214},
     zbl = {0764.05068},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1991__27_3-4_a6/}
}