Densities for certain l-ranks in cyclic fields of degree l n
Compositio Mathematica, Tome 60 (1986) no. 3, pp. 295-322. 
@article{CM_1986__60_3_295_0,
     author = {Gerth, III, Frank},
     title = {Densities for certain $l$-ranks in cyclic fields of degree $l^n$},
     journal = {Compositio Mathematica},
     pages = {295--322},
     publisher = {Martinus Nijhoff Publishers},
     volume = {60},
     number = {3},
     year = {1986},
     mrnumber = {869105},
     zbl = {0608.12008},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1986__60_3_295_0/}
}
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Gerth, III, Frank. Densities for certain $l$-ranks in cyclic fields of degree $l^n$. Compositio Mathematica, Tome 60 (1986) no. 3, pp. 295-322. http://archive.numdam.org/item/CM_1986__60_3_295_0/

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