Neukirch, J. (1991), Ebbinghaus, Heinz-Dieter; Hermes, Hans; Hirzebruch, Friedrich; Koecher, Max (eds.), "The p-Adic Numbers", Numbers, Graduate Texts in Mathematics, vol. 123, New York, NY: Springer, pp. 155–178, doi:10.1007/978-1-4612-1005-4_7, ISBN978-1-4612-1005-4, retrieved 2022-08-14