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Kummer’s criterion for Hurwitz numbers. (English) Zbl 0369.12009
Algebr. Number Theory, Pap. Kyoto int. Symp. 1976, 9-23 (1977).

##### MSC:
 11R42 Zeta functions and $$L$$-functions of number fields 11S40 Zeta functions and $$L$$-functions 11R11 Quadratic extensions