@article{JRAM_1985__361_152758,
     author = {Harvey Cohn},
     title = {Representation of a prime as the sum of squares in a tower of fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {135--144},
     publisher = {mathdoc},
     volume = {361},
     year = {1985},
     zbl = {0559.12001},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__361_152758/}
}