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. Conner, P. E., Hurrelbrink, J.: Class Number Parity, Ser. Pure Math. 8, Would Sci., Singapore 1988
3. Hurrelbrink, J., Yue, Q.: On ideal class groups and units in terms of the quadratic form x 2+32y 2. Chin, Ann. Math., 26B(2), 239–252 (2005)
4. Nemenzo, F. R.: On a theorem of Scholz on the class number of quadratic fields. Proc. Japan Aca. Ser. A, 80, 9–11 (2004)
5. Rédei, L., Reichardt, H.: Die Anzahl der durch 4 feil-baren Invarianten der Klassengruppe eines beliebigen quadratischen Zahlkórpes. J. Reine Angew. Math., 170, 69–74 (1934)