@article{AUCMP_1986_27_1_a1,
     author = {V{\'\i}tek, Milan},
     title = {Graphs and quasitrivial groupoids},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {3--15},
     year = {1986},
     volume = {27},
     number = {1},
     mrnumber = {0878617},
     zbl = {0619.05046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1986_27_1_a1/}
}