@article{GDZPPN002209128,
title = {Estimates on the semigroups generated by left invariant operators on Lie groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {426},
year = {1992},
pages = {1-46},
zbl = {0745.47025},
url = {http://dml.mathdoc.fr/item/GDZPPN002209128}
}
Hebisch, Waldemar. Estimates on the semigroups generated by left invariant operators on Lie groups.. Journal für die reine und angewandte Mathematik, Tome 426 (1992) pp. 1-46. http://gdmltest.u-ga.fr/item/GDZPPN002209128/