1. Ankeny, N.C., Chowla, S., Hasse, H.: On the class number of the real subfield of a cyclotomic field. J. Reine Angew. Math. 217, 217–220 (1965)
2. Barban, M.B.: The “large sieve” method and its application to number theory. Russ. Math. Surv. 21, 49–103 (1966)
3. Conrey, J.B., Iwaniec, H.: The cubic moment of central values of automorphic L-functions. Ann. Math. (2) 151, 1175–1216 (2000)
4. Davenport, H.: The Higher Arithmetic—an Introduction to the Theory of Numbers, 8th edn. Cambridge University Press, Cambridge (2008)
5. Datskovsky, B.A.: A mean-value theorem for class numbers of quadratic extensions. Number Theory Relat. Anal. Contemp. Math. 143, 179–242 (1993)