@article{EXMATH_1994_1994_1_a31,
     author = {Le\'on, Manuel de and Mart{\'\i}n de Diego, David},
     title = {Clasificaci\'on de simetr{\'\i}as para sistemas lagrangianos de orden superior {II:} {Caso} no aut\'onomo.},
     journal = {Extracta mathematicae},
     pages = {111-114},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1994_1994_1_a31/}
}