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@article{CM_1979__39_1_3_0, author = {Gerth, III, Frank}, title = {Upper bounds for an {Iwasawa} invariant}, journal = {Compositio Mathematica}, pages = {3--10}, publisher = {Sijthoff et Noordhoff International Publishers}, volume = {39}, number = {1}, year = {1979}, mrnumber = {538999}, zbl = {0406.12005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1979__39_1_3_0/} }
Gerth, III, Frank. Upper bounds for an Iwasawa invariant. Compositio Mathematica, Tome 39 (1979) no. 1, pp. 3-10. http://geodesic.mathdoc.fr/item/CM_1979__39_1_3_0/