@article{PM_2006_2006_1_a15,
     author = {Ngoc Son, Duong},
     title = {Observaciones sobre las envolventes subarm\'onicas.},
     journal = {Publicacions matem\`atiques},
     pages = {447-456},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2006_2006_1_a15/}
}