@article{10_4064_sm_131_1_63_71,
     author = {Waldemar Hebisch},
     title = {On operators satisfying the {Rockland} condition},
     journal = {Studia Mathematica},
     pages = {63--71},
     publisher = {mathdoc},
     volume = {131},
     number = {1},
     year = {1998},
     doi = {10.4064/sm-131-1-63-71},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-131-1-63-71/}
}