@article{PM_2004_2004_1_a6,
     author = {Auscher, Pascal},
     title = {Estimaciones {Lp} para ra{\'\i}ces cuadradas de operadores el{\'\i}pticos de segundo orden en {Rn.}},
     journal = {Publicacions matem\`atiques},
     pages = {159-186},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2004_2004_1_a6/}
}