@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/