@article{MZ_1972__124_171651, author = {Ian G. Connell}, title = {The {Stufe} of {Number} {Fields.}}, journal = {Mathematische Zeitschrift}, pages = {20--22}, publisher = {mathdoc}, volume = {124}, year = {1972}, zbl = {0219.12019}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171651/} }