@article{1077489481,
author = {Morse, Marston and Van Schaack, George B.},
title = {Critical point theory under general boundary conditions},
journal = {Duke Math. J.},
volume = {2},
number = {1},
year = {1936},
pages = { 220-242},
language = {en},
url = {http://dml.mathdoc.fr/item/1077489481}
}
Morse, Marston; Van Schaack, George B. Critical point theory under general boundary conditions. Duke Math. J., Tome 2 (1936) no. 1, pp. 220-242. http://gdmltest.u-ga.fr/item/1077489481/