@article{PM_2004_2004_1_a18,
     author = {Magnani, Valentino},
     title = {Nota sobre f\'ormulas de co\'area en el grupo de {Heisenberg.}},
     journal = {Publicacions matem\`atiques},
     pages = {409-422},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2004_2004_1_a18/}
}