MathSciNet bibliographic data MR528968 (81a:12005) 12A35 (12A50) Ferrero, Bruce; Washington, Lawrence C. The Iwasawa invariant $\mu \sb{p}$$\mu \sb{p}$ vanishes for abelian number fields. Ann. of Math. (2) 109 (1979), no. 2, 377–395. Article

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