@article{10_21136_CMJ_1972_101102,
     author = {Havel, Ivan and Mor\'avek, Jaroslav},
     title = {$B$-valuations of graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {338--351},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1972},
     doi = {10.21136/CMJ.1972.101102},
     mrnumber = {0294159},
     zbl = {0247.05148},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101102/}
}