@article{PM_1996_1996_1_a21,
     author = {Semmes, Stephen},
     title = {Algunos comentarios sobre espacios m\'etricos, mapeos esf\'ericos, funciones y sus derivadas.},
     journal = {Publicacions matem\`atiques},
     pages = {411-430},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1996_1996_1_a21/}
}