@article{CMUC_1970__11_3_a9,
     author = {Nebesk\'y, Ladislav},
     title = {Graphic algebras},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {533--544},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1970},
     mrnumber = {0268107},
     zbl = {0208.02701},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970__11_3_a9/}
}