On determining the quadratic subfields of Z 2 -extensions of complex quadratic fields
Carroll, Joseph E.
Compositio Mathematica, Tome 31 (1975), p. 259-271 / Harvested from Numdam
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@article{CM_1975__30_3_259_0,
     author = {Carroll, Joseph},
     title = {On determining the quadratic subfields of $Z\_2$-extensions of complex quadratic fields},
     journal = {Compositio Mathematica},
     volume = {31},
     year = {1975},
     pages = {259-271},
     mrnumber = {374082},
     zbl = {0314.12005},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CM_1975__30_3_259_0}
}

Carroll, Joseph E. On determining the quadratic subfields of $Z_2$-extensions of complex quadratic fields. Compositio Mathematica, Tome 31 (1975) pp. 259-271. http://gdmltest.u-ga.fr/item/CM_1975__30_3_259_0/

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