@article{JRAM_1990__411_153265, author = {A. Hulanicki and Eva Damek}, title = {Boundaries for left-invariant sub-elliptic operators on semidirect products of nilpotent and abelian groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--38}, publisher = {mathdoc}, volume = {411}, year = {1990}, zbl = {0699.22012}, url = {http://geodesic.mathdoc.fr/item/JRAM_1990__411_153265/} }