@article{1077474670, author = {Helsel, R. G. and Rad\'o, T.}, title = {The Cauchy area of a Fr\'echet surface}, journal = {Duke Math. J.}, volume = {15}, number = {1}, year = {1948}, pages = { 159-167}, language = {en}, url = {http://dml.mathdoc.fr/item/1077474670} }
Helsel, R. G.; Radó, T. The Cauchy area of a Fréchet surface. Duke Math. J., Tome 15 (1948) no. 1, pp. 159-167. http://gdmltest.u-ga.fr/item/1077474670/