@article{10_4153_CMB_2011_173_1,
     author = {Oukhaba, Hassan and Vigui\'e, St\'ephane},
     title = {On the {Gras} {Conjecture} for {Imaginary} {Quadratic} {Fields}},
     journal = {Canadian mathematical bulletin},
     pages = {148--160},
     year = {2013},
     volume = {56},
     number = {1},
     doi = {10.4153/CMB-2011-173-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-173-1/}
}