@article{10_1017_S0017089500008983,
     author = {Neeb, Karl-Hermann},
     title = {On the fundamental group of a {Lie} semigroup},
     journal = {Glasgow mathematical journal},
     pages = {379--394},
     year = {1992},
     volume = {34},
     number = {3},
     doi = {10.1017/S0017089500008983},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008983/}
}