@article{MAN_1981__255_182829,
     author = {Harvey Cohn},
     title = {Iterated {Ring} {Class} {Fields} and the {Icosahedron.}},
     journal = {Mathematische Annalen},
     pages = {107--122},
     publisher = {mathdoc},
     volume = {255},
     year = {1981},
     zbl = {0437.12010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__255_182829/}
}