@article{10_21136_CMJ_1971_101034,
     author = {Chv\'atal, V\'aclav},
     title = {Some relations among invariants of graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {366--368},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1971},
     doi = {10.21136/CMJ.1971.101034},
     mrnumber = {0286697},
     zbl = {0221.05073},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101034/}
}