@article{EXMATH_2003_2003_1_a12,
     author = {Massa, Enrico and Vignolo, Stefano},
     title = {Un nuevo marco geom\'etrico para la mec\'anica hamiltoniana dependiente del tiempo.},
     journal = {Extracta mathematicae},
     pages = {107-118},
     year = {2003},
     volume = {18},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2003_2003_1_a12/}
}