@article{MASLO_1965__15_4_a1,
     author = {Zelinka, Bohdan},
     title = {Graf syst\'emu t\v{e}tiv dan\'e kru\v{z}nice},
     journal = {Mathematica slovaca},
     pages = {273--279},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1965},
     mrnumber = {0194365},
     zbl = {0142.41601},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1965__15_4_a1/}
}