@article{PM_2007_2007_1_a20,
     author = {Friedman, Eduardo},
     title = {Reguladores y positividad total.},
     journal = {Publicacions matem\`atiques},
     publisher = {mathdoc},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2007_2007_1_a20/}
}