@article{GDZPPN00219659X,
title = {Independent systems of units in certain algebraic number fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {310},
year = {1979},
pages = {116-144},
zbl = {0409.12006},
url = {http://dml.mathdoc.fr/item/GDZPPN00219659X}
}
Frei, Günther; Levesque, Claude. Independent systems of units in certain algebraic number fields.. Journal für die reine und angewandte Mathematik, Tome 310 (1979) pp. 116-144. http://gdmltest.u-ga.fr/item/GDZPPN00219659X/