@article{1183525268, author = {Maskit, Bernard}, title = {On a conjecture concerning planar coverings of surfaces}, journal = {Bull. Amer. Math. Soc.}, volume = {69}, number = {4}, year = {1963}, pages = { 396-398}, language = {en}, url = {http://dml.mathdoc.fr/item/1183525268} }
Maskit, Bernard. On a conjecture concerning planar coverings of surfaces. Bull. Amer. Math. Soc., Tome 69 (1963) no. 4, pp. 396-398. http://gdmltest.u-ga.fr/item/1183525268/