1. Barrucand, P., Cohn, H.: Note on primes of type x 2+32y 2, class number, and residuacity. J. Reine Angew. Math., 238, 67–70 (1969)
2. Browkin, J., Schinzel, A.: On Sylow 2-subgroups of K 2 O F for quadratic number fields F. J. Reine Angew. Math., 331, 104–113 (1982)
3. Browkin, J.: The functor K 2 for the ring of integers of a number field, Universal Algebra and Applications (Warsaw, 1978), Banach Center Publications, vol. 9, PWN, Warsaw, 187–195, 1982
4. Browkin, J., Gangl, H.: Tame and wild kernels of quadratic imaginary number fields. Math. Comp., 68(225), 291–305 (1999)
5. Cheng, X.: A note on the 4-rank densities of K 2 O F for quadratic number fields F. Comm. Algebra, 36(5), 1634–164 (2008)