@article{GDZPPN001260081,
title = {On open subsemigroups of connected groups.},
journal = {Semigroup forum},
volume = {38},
year = {1989},
pages = {347-362},
zbl = {0676.22001},
url = {http://dml.mathdoc.fr/item/GDZPPN001260081}
}
Ruppert, W.A.F. On open subsemigroups of connected groups.. Semigroup forum, Tome 38 (1989) pp. 347-362. http://gdmltest.u-ga.fr/item/GDZPPN001260081/