@article{MASLO_1969__19_3_a5,
     author = {Jucovi\v{c}, Ernest},
     title = {On a {Problem} in {Map} {Colouring}},
     journal = {Mathematica slovaca},
     pages = {225--227},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1969},
     mrnumber = {0345860},
     zbl = {0187.21001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1969__19_3_a5/}
}