@article{00887281,
title = {Semigroups in lattices of solvable Lie groups.},
journal = {Journal of Lie Theory},
volume = {5},
year = {1995},
pages = {179-202},
zbl = {0855.22003},
language = {en},
url = {http://dml.mathdoc.fr/item/00887281}
}
do Rocio, Osvaldo Germano; San Martin, Luiz A.B. Semigroups in lattices of solvable Lie groups.. Journal of Lie Theory, Tome 5 (1995) pp. 179-202. http://gdmltest.u-ga.fr/item/00887281/