@article{MZ_1994__215_1_174603,
     author = {Niels Jacob},
     title = {A class of {Feller} semigroups generated by pseudo differential operators.},
     journal = {Mathematische Zeitschrift},
     pages = {151--166},
     publisher = {mathdoc},
     volume = {215},
     number = {1},
     year = {1994},
     zbl = {0795.35154},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__215_1_174603/}
}