@article{1183524158,
author = {Dade, E. C. and Taussky, O. and Zassenhaus, H.},
title = {On the semigroup of ideal classes in an order of an algebraic number field},
journal = {Bull. Amer. Math. Soc.},
volume = {67},
number = {6},
year = {1961},
pages = { 305-308},
language = {en},
url = {http://dml.mathdoc.fr/item/1183524158}
}
Dade, E. C.; Taussky, O.; Zassenhaus, H. On the semigroup of ideal classes in an order of an algebraic number field. Bull. Amer. Math. Soc., Tome 67 (1961) no. 6, pp. 305-308. http://gdmltest.u-ga.fr/item/1183524158/