@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/