@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/