@article{10_21136_CPM_1965_108651,
     author = {Sedl\'a\v{c}ek, Ji\v{r}{\'\i}},
     title = {Directed graphs and their incidence matrices},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {435--441},
     publisher = {mathdoc},
     volume = {090},
     number = {4},
     year = {1965},
     doi = {10.21136/CPM.1965.108651},
     mrnumber = {0190036},
     zbl = {0138.19502},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1965.108651/}
}