@article{10_4064_sm_89_2_169_196,
     author = {Ewa Damek},
     title = {Left-invariant degenerate elliptic operators on semidirect extensions of homogeneous groups},
     journal = {Studia Mathematica},
     pages = {169--196},
     publisher = {mathdoc},
     volume = {89},
     number = {2},
     year = {1988},
     doi = {10.4064/sm-89-2-169-196},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-89-2-169-196/}
}