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@article{MAN_1985__270_182943, author = {Harvey Cohn}, title = {Iterated {Ring} {Class} {Fields} and the {168-Tesselation.}}, journal = {Mathematische Annalen}, pages = {69--78}, publisher = {mathdoc}, volume = {270}, year = {1985}, zbl = {0559.12007}, url = {http://geodesic.mathdoc.fr/item/MAN_1985__270_182943/} }
Harvey Cohn. Iterated Ring Class Fields and the 168-Tesselation.. Mathematische Annalen, Tome 270 (1985), pp. 69-78. http://geodesic.mathdoc.fr/item/MAN_1985__270_182943/