@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/