@article{CMH_1939__12_138748,
     author = {Pierre Humbert},
     title = {Sur les nombres de classes de certains corps quadratiques.},
     journal = {Commentarii mathematici Helvetici},
     pages = {233--245},
     publisher = {mathdoc},
     volume = {12},
     year = {1939},
     zbl = {0023.10401},
     url = {http://geodesic.mathdoc.fr/item/CMH_1939__12_138748/}
}