@article{RMI_2001_2001_1_a0,
     author = {Hofmann, Steve and Lewis, John L.},
     title = {Funciones cuadradas de tipo {Calder\'on} y aplicaciones.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {1-20},
     year = {2001},
     volume = {17},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_2001_2001_1_a0/}
}