@article{10_21136_CPM_1984_118204,
     author = {Kom\'arek, Pavel},
     title = {Some new good characterizations for directed graphs},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {348--354},
     publisher = {mathdoc},
     volume = {109},
     number = {4},
     year = {1984},
     doi = {10.21136/CPM.1984.118204},
     mrnumber = {774277},
     zbl = {0569.05022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1984.118204/}
}