@article{1183502715,
author = {Patterson, William A.},
title = {Inverse problems of the calculus of variations for multiple integrals},
journal = {Bull. Amer. Math. Soc.},
volume = {46},
number = {11},
year = {1940},
pages = { 502-511},
language = {en},
url = {http://dml.mathdoc.fr/item/1183502715}
}
Patterson, William A. Inverse problems of the calculus of variations for multiple integrals. Bull. Amer. Math. Soc., Tome 46 (1940) no. 11, pp. 502-511. http://gdmltest.u-ga.fr/item/1183502715/