@article{RLIN_2001_9_12_1_a2,
     author = {Ricci, Fulvio and Unterberger, J\'er\'emie},
     title = {Solvability of invariant sublaplacians on spheres and group contractions},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {27--42},
     publisher = {mathdoc},
     volume = {Ser. 9, 12},
     number = {1},
     year = {2001},
     zbl = {1170.35373},
     mrnumber = {1211412},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_2001_9_12_1_a2/}
}