@article{JRAM_1992__423_153380,
     author = {Waldemar Hebisch},
     title = {Estimates on the semigroups generated by left invariant operators on {Lie} groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--46},
     publisher = {mathdoc},
     volume = {423},
     year = {1992},
     zbl = {0745.47025},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1992__423_153380/}
}