@article{PM_2004_2004_1_a11,
     author = {Harjulehto, Petteri and Kinnunen, Juha},
     title = {Bases de diferenciaci\'on para funciones de {Sobolev} en espacios m\'etricos.},
     journal = {Publicacions matem\`atiques},
     pages = {381-395},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2004_2004_1_a11/}
}