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@article{PORMA_1956__15_2_114768, author = {Is\'eki, Kiyoshi}, title = {Generalisation of a theorem by {S.} {Schwarz} on semigroup}, journal = {Portugaliae mathematica}, pages = {71--72}, publisher = {mathdoc}, volume = {15}, number = {2}, year = {1956}, zbl = {0073.01102}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1956__15_2_114768/} }
Iséki, Kiyoshi. Generalisation of a theorem by S. Schwarz on semigroup. Portugaliae mathematica, Tome 15 (1956) no. 2, pp. 71-72. http://geodesic.mathdoc.fr/item/PORMA_1956__15_2_114768/