On 2-class field towers of imaginary quadratic number fields
Journal de théorie des nombres de Bordeaux, Volume 6 (1994) no. 2, pp. 261-272.

For a number field k, let k 1 denote its Hilbert 2-class field, and put k 2 =(k 1 ) 1 . We will determine all imaginary quadratic number fields k such that G=Gal(k 2 /k) is abelian or metacyclic, and we will give G in terms of generators and relations.

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     title = {On $2$-class field towers of imaginary quadratic number fields},
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Franz Lemmermeyer. On $2$-class field towers of imaginary quadratic number fields. Journal de théorie des nombres de Bordeaux, Volume 6 (1994) no. 2, pp. 261-272. https://jtnb.centre-mersenne.org/item/JTNB_1994__6_2_261_0/

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