@article{GDZPPN002200163,
title = {Irreducible representations of exponential solvable Lie groups and operators with smooth kernels.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {341},
year = {1983},
pages = {1-26},
zbl = {0492.22007},
url = {http://dml.mathdoc.fr/item/GDZPPN002200163}
}
Ludwig, Jean. Irreducible representations of exponential solvable Lie groups and operators with smooth kernels.. Journal für die reine und angewandte Mathematik, Tome 341 (1983) pp. 1-26. http://gdmltest.u-ga.fr/item/GDZPPN002200163/