@article{10_4064_cm122_1_13,
     author = {St\'ephane R. Louboutin},
     title = {Some quartic number fields containing
an imaginary quadratic subfield},
     journal = {Colloquium Mathematicum},
     pages = {139--148},
     publisher = {mathdoc},
     volume = {122},
     number = {1},
     year = {2011},
     doi = {10.4064/cm122-1-13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm122-1-13/}
}