The ℓ-rank of the real class group of cyclotomic fields
Compositio Mathematica, Tome 53 (1984) no. 2, pp. 133-141. 
@article{CM_1984__53_2_133_0,
     author = {Cornell, Gary and Rosen, Michael I.},
     title = {The $\ell $-rank of the real class group of cyclotomic fields},
     journal = {Compositio Mathematica},
     pages = {133--141},
     publisher = {Martinus Nijhoff Publishers},
     volume = {53},
     number = {2},
     year = {1984},
     mrnumber = {766293},
     zbl = {0551.12006},
     language = {en},
     url = {http://www.numdam.org/item/CM_1984__53_2_133_0/}
}
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Cornell, Gary; Rosen, Michael I. The $\ell $-rank of the real class group of cyclotomic fields. Compositio Mathematica, Tome 53 (1984) no. 2, pp. 133-141. http://www.numdam.org/item/CM_1984__53_2_133_0/

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