%0 Journal Article %A VetchĂ˝, VladimĂ­r %T Metrically regular square of metrically regular bipartite graphs of diameter $D=6$ %J Archivum mathematicum %D 1993 %P 29-38 %V 29 %N 1-2 %U http://geodesic.mathdoc.fr/item/ARM_1993_29_1-2_a5/ %G en %F ARM_1993_29_1-2_a5