@article{MAN_1975__214_162688,
     author = {Lawrence C. Washington},
     title = {Class {Numbers} and {Zp-Extensions.}},
     journal = {Mathematische Annalen},
     pages = {177--194},
     publisher = {mathdoc},
     volume = {214},
     year = {1975},
     zbl = {0302.12007},
     url = {http://geodesic.mathdoc.fr/item/MAN_1975__214_162688/}
}