MathSciNet bibliographic data MR1611205 11R29 Park, Young-Ho; Kwon, Soun-Hi Determination of all non-quadratic imaginary cyclic number fields of \$2\$$2$-power degree with relative class number \$\le20\$$\le20$. Acta Arith. 83 (1998), no. 3, 211–223. Journal

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