@article{1183497366,
author = {Hestenes, M. R.},
title = {A note on the Jacobi condition for parametric problems in the calculus of variations},
journal = {Bull. Amer. Math. Soc.},
volume = {40},
number = {12},
year = {1934},
pages = { 297-302},
language = {en},
url = {http://dml.mathdoc.fr/item/1183497366}
}
Hestenes, M. R. A note on the Jacobi condition for parametric problems in the calculus of variations. Bull. Amer. Math. Soc., Tome 40 (1934) no. 12, pp. 297-302. http://gdmltest.u-ga.fr/item/1183497366/