@article{1077473378,
author = {Lewis, J. V.},
title = {The existence of solutions to Lagrange problems for multiple
integrals},
journal = {Duke Math. J.},
volume = {12},
number = {1},
year = {1945},
pages = { 705-722},
language = {en},
url = {http://dml.mathdoc.fr/item/1077473378}
}
Lewis, J. V. The existence of solutions to Lagrange problems for multiple
integrals. Duke Math. J., Tome 12 (1945) no. 1, pp. 705-722. http://gdmltest.u-ga.fr/item/1077473378/