@article{MV_1967_19_3_a17,
     author = {A. U\v{s}an},
     title = {Nekotorye zame\v{c}ania o klikah i obobshchenie na n-arnye polukliki},
     journal = {Matemati\v{c}ki vesnik},
     pages = {307 },
     year = {1967},
     volume = {19},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/MV_1967_19_3_a17/}
}