@article{MM2_1979__30_154687,
     author = {Daniel J. Madden and William Yslas Velez},
     title = {A {Note} on the {Normality} of {Unramified,} {Abelian} {Extensions} of {Quadratic} {Extensions.}},
     journal = {Manuscripta mathematica},
     pages = {343--350},
     publisher = {mathdoc},
     volume = {30},
     year = {1979},
     zbl = {0428.12007},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__30_154687/}
}