@article{CMUC_1967_8_1_a4,
     author = {Bla\v{z}ek, Jaroslav and Koman, Milan},
     title = {On an extremal problem concerning graphs {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {49--52},
     year = {1967},
     volume = {8},
     number = {1},
     mrnumber = {0210620},
     zbl = {0166.19901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967_8_1_a4/}
}