@article{106174, author = {David M. Berman}, title = {A note on choosability in planar graphs}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {023}, year = {1982}, pages = {537-540}, zbl = {0505.05029}, mrnumber = {677861}, language = {en}, url = {http://dml.mathdoc.fr/item/106174} }
Berman, David M. A note on choosability in planar graphs. Commentationes Mathematicae Universitatis Carolinae, Tome 023 (1982) pp. 537-540. http://gdmltest.u-ga.fr/item/106174/
Choosability in Graphs, Proc. West Coast Conference on Combinatorics, Graph Theory, and Computing, Arcala, Calif., 1979 (Utilitas Math, Publ. Inc., Winnipeg 1980), 125-157. (1979) | MR 0593902