@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/