@article{PM_2006_2006_1_a2,
     author = {Spaggiari, Fulvia},
     title = {Asfericidad de presentaciones sim\'etricas.},
     journal = {Publicacions matem\`atiques},
     pages = {133-147},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2006_2006_1_a2/}
}