@article{RMI_1986_1986_1_a6,
     author = {Segal, Irving E.},
     title = {Estructuras {Poincar\'e-invariantes} en la variedad soluci\'on de una ecuaci\'on de onda no lineal.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {99-104},
     publisher = {mathdoc},
     volume = {2},
     number = {1-2},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_1986_1986_1_a6/}
}