Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1976__17_1_a11, author = {Kastl, Jan}, title = {Die $K$-abgeschlossenen {Teilmengen} der {Halbgruppen}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {135--146}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1976}, mrnumber = {0404509}, zbl = {0359.20067}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/CMUC_1976__17_1_a11/} }
Kastl, Jan. Die $K$-abgeschlossenen Teilmengen der Halbgruppen. Commentationes Mathematicae Universitatis Carolinae, Tome 17 (1976) no. 1, pp. 135-146. http://geodesic.mathdoc.fr/item/CMUC_1976__17_1_a11/