@article{1077491900,
author = {Morse, Marston},
title = {The first variation in minimal surface theory},
journal = {Duke Math. J.},
volume = {6},
number = {1},
year = {1940},
pages = { 263-289},
language = {en},
url = {http://dml.mathdoc.fr/item/1077491900}
}
Morse, Marston. The first variation in minimal surface theory. Duke Math. J., Tome 6 (1940) no. 1, pp. 263-289. http://gdmltest.u-ga.fr/item/1077491900/