@article{1029004393, author = {Norton, Alec and Pugh, Charles}, title = {Critical sets in the plane.}, journal = {Michigan Math. J.}, volume = {38}, number = {1}, year = {1991}, pages = { 441-459}, language = {en}, url = {http://dml.mathdoc.fr/item/1029004393} }
Norton, Alec; Pugh, Charles. Critical sets in the plane.. Michigan Math. J., Tome 38 (1991) no. 1, pp. 441-459. http://gdmltest.u-ga.fr/item/1029004393/