@article{urn:eudml:doc:38393, title = {Classification of symmetries for higher order Lagrangian systems.}, journal = {Extracta Mathematicae}, volume = {9}, year = {1994}, pages = {32-36}, zbl = {1027.37503}, mrnumber = {MR1304148}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38393} }
León, Manuel de; Martín de Diego, David. Classification of symmetries for higher order Lagrangian systems.. Extracta Mathematicae, Tome 9 (1994) pp. 32-36. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38393/