@article{1183500404,
author = {Albert, A. Adrian},
title = {A quadratic form problem in the calculus of variations},
journal = {Bull. Amer. Math. Soc.},
volume = {44},
number = {11},
year = {1938},
pages = { 250-253},
language = {en},
url = {http://dml.mathdoc.fr/item/1183500404}
}
Albert, A. Adrian. A quadratic form problem in the calculus of variations. Bull. Amer. Math. Soc., Tome 44 (1938) no. 11, pp. 250-253. http://gdmltest.u-ga.fr/item/1183500404/