@article{GDZPPN002197227,
title = {Symmetry and nonsymmetry for a class of exponential Lie groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {316},
year = {1980},
pages = {127-138},
zbl = {0419.22014},
url = {http://dml.mathdoc.fr/item/GDZPPN002197227}
}
Poguntke, Detlev. Symmetry and nonsymmetry for a class of exponential Lie groups.. Journal für die reine und angewandte Mathematik, Tome 316 (1980) pp. 127-138. http://gdmltest.u-ga.fr/item/GDZPPN002197227/