@article{GDZPPN002187817,
title = {Class numbers of imaginary qudratic fields having exactly three discriminantal divisors.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {258},
year = {1973},
pages = {31-34},
zbl = {0273.12006},
url = {http://dml.mathdoc.fr/item/GDZPPN002187817}
}
Brown, Ezra; Parry, Charles J. Class numbers of imaginary qudratic fields having exactly three discriminantal divisors.. Journal für die reine und angewandte Mathematik, Tome 258 (1973) pp. 31-34. http://gdmltest.u-ga.fr/item/GDZPPN002187817/