On determining the quadratic subfields of Z 2 -extensions of complex quadratic fields
Compositio Mathematica, Volume 30 (1975) no. 3, p. 259-271
@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},
     publisher = {Noordhoff International Publishing},
     volume = {30},
     number = {3},
     year = {1975},
     pages = {259-271},
     zbl = {0314.12005},
     mrnumber = {374082},
     language = {en},
     url = {http://www.numdam.org/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, Volume 30 (1975) no. 3, pp. 259-271. http://www.numdam.org/item/CM_1975__30_3_259_0/

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