%0 Journal Article %A Sedláček, Jiří %T Directed graphs and their incidence matrices %J Časopis pro pěstování matematiky %D 1965 %P 435-441 %V 090 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1965.108651/ %R 10.21136/CPM.1965.108651 %G en %F 10_21136_CPM_1965_108651