@article{GRSME_1999_1999_1_a8,
     author = {Girbau, Joan},
     title = {Relatividad: un curso acelerado.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {237-262},
     year = {1999},
     volume = {2},
     number = {2},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_1999_1999_1_a8/}
}