Quadratic fields with $3$rank equal to $4$
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 by F. Diaz y Diaz, Daniel Shanks and H. C. Williams PDF
 Math. Comp. 33 (1979), 836840 Request permission
Abstract:
In [2] there is reference to 119 known imaginary quadratic fields that have 3rank $r \geqslant 4$. We examine these fields and determine the exact values of r. Their associated real fields and the distribution of their 3Sylow subgroups are also studied. Some of the class groups are recorded since they are of special interest. These include examples having an infinite class field tower and only one ramified prime, and others having an infinite tower because of two different components of their class groups.References

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Additional Information
 © Copyright 1979 American Mathematical Society
 Journal: Math. Comp. 33 (1979), 836840
 MSC: Primary 12A25; Secondary 12A50
 DOI: https://doi.org/10.1090/S00255718197905212994
 MathSciNet review: 521299