@article{GDZPPN002292084,
title = {On the Uniqueness of Character Semigroups.},
journal = {Mathematische Annalen},
volume = {152},
year = {1963},
pages = {346-354},
zbl = {0114.25302},
url = {http://dml.mathdoc.fr/item/GDZPPN002292084}
}
ROTHMAN, N.J. On the Uniqueness of Character Semigroups.. Mathematische Annalen, Tome 152 (1963) pp. 346-354. http://gdmltest.u-ga.fr/item/GDZPPN002292084/