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@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/} }
Ian G. Connell. The Stufe of Number Fields.. Mathematische Zeitschrift, Tome 124 (1972), pp. 20-22. http://geodesic.mathdoc.fr/item/MZ_1972__124_171651/