@article{RMI_1987_1987_1_a4,
     author = {Caffarelli, Luis A.},
     title = {Una aproximaci\'on basada en la desigualdad de {Harnack} a la regularidad de las fronteras libres. {Parte} {I:} {Las} fronteras libres de {Lipschitz} son {C1,\ensuremath{\alpha}.}},
     journal = {Revista matem\'atica iberoamericana},
     pages = {139-162},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_1987_1987_1_a4/}
}