@article{GDZPPN00248787X,
title = {Objects Dual to Subsemigroups of Groups.},
journal = {Monatshefte f\"ur Mathematik},
volume = {112},
year = {1991},
pages = {303-322},
zbl = {0737.22002},
url = {http://dml.mathdoc.fr/item/GDZPPN00248787X}
}
Neeb, Karl-Hermann. Objects Dual to Subsemigroups of Groups.. Monatshefte für Mathematik, Tome 112 (1991) pp. 303-322. http://gdmltest.u-ga.fr/item/GDZPPN00248787X/