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@article{DMGT_1996_16_2_a3, author = {Hor\v{n}\'ak, Mirko and Jendrol, Stanislav}, title = {Unavoidable set of face types for planar maps}, journal = {Discussiones Mathematicae. Graph Theory}, pages = {123--141}, publisher = {mathdoc}, volume = {16}, number = {2}, year = {1996}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DMGT_1996_16_2_a3/} }
Horňák, Mirko; Jendrol, Stanislav. Unavoidable set of face types for planar maps. Discussiones Mathematicae. Graph Theory, Tome 16 (1996) no. 2, pp. 123-141. http://geodesic.mathdoc.fr/item/DMGT_1996_16_2_a3/