@article{1102736580,
author = {Arens, Richard},
title = {Reducing the order of a Lagrangian.},
journal = {Pacific J. Math.},
volume = {97},
number = {2},
year = {1981},
pages = { 1-11},
language = {en},
url = {http://dml.mathdoc.fr/item/1102736580}
}
Arens, Richard. Reducing the order of a Lagrangian.. Pacific J. Math., Tome 97 (1981) no. 2, pp. 1-11. http://gdmltest.u-ga.fr/item/1102736580/