@article{10_4064_aa121_3_1,
     author = {St\'ephane R. Louboutin},
     title = {Lower bounds for relative class numbers
 of imaginary abelian number fields and {CM-fields}},
     journal = {Acta Arithmetica},
     pages = {199--220},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {2006},
     doi = {10.4064/aa121-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa121-3-1/}
}