Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@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/} }
Jucovič, Ernest. On a Problem in Map Colouring. Mathematica slovaca, Tome 19 (1969) no. 3, pp. 225-227. http://geodesic.mathdoc.fr/item/MASLO_1969__19_3_a5/