@article{RMI_1993_1993_1_a6,
     author = {Jacob, Niels},
     title = {M\'as operadores pseudodiferenciales generadores de semigrupos de {Feller} y formas de {Dirichlet.}},
     journal = {Revista matem\'atica iberoamericana},
     pages = {373-407},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_1993_1993_1_a6/}
}