@article{10_21136_CPM_1986_118289,
     author = {Kom\'arek, Pavel},
     title = {On good characterizations for digraphs},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {424--430},
     publisher = {mathdoc},
     volume = {111},
     number = {4},
     year = {1986},
     doi = {10.21136/CPM.1986.118289},
     mrnumber = {871717},
     zbl = {0609.05040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1986.118289/}
}