@article{1077491729, author = {Helmer, Olaf}, title = {Theorems of the Picard type}, journal = {Duke Math. J.}, volume = {6}, number = {1}, year = {1940}, pages = { 38-47}, language = {en}, url = {http://dml.mathdoc.fr/item/1077491729} }
Helmer, Olaf. Theorems of the Picard type. Duke Math. J., Tome 6 (1940) no. 1, pp. 38-47. http://gdmltest.u-ga.fr/item/1077491729/