@article{2278, author = {Is\'eki, Kiyoshi}, title = {Generalisation of a theorem by S. Schwarz on semigroup}, journal = {Portugaliae mathematica}, volume = {15}, year = {1956}, pages = {71-72}, zbl = {0073.01102}, language = {en}, url = {http://dml.mathdoc.fr/item/2278} }
Iséki, Kiyoshi. Generalisation of a theorem by S. Schwarz on semigroup. Portugaliae mathematica, Tome 15 (1956) pp. 71-72. http://gdmltest.u-ga.fr/item/2278/