@article{GDZPPN00125488X,
title = {Group ideals in a semigroup of measures.},
journal = {Semigroup forum},
volume = {23},
year = {1981},
pages = {325-330},
zbl = {0472.28005},
url = {http://dml.mathdoc.fr/item/GDZPPN00125488X}
}
Shum, Kar-Ping. Group ideals in a semigroup of measures.. Semigroup forum, Tome 23 (1981) pp. 325-330. http://gdmltest.u-ga.fr/item/GDZPPN00125488X/