@article{JRAM_1976__0286_0287_151773,
     author = {Arnold K. Pizer},
     title = {Class numbers of positive definite quaternary quadratic forms.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {101--123},
     year = {1976},
     volume = {0286_0287},
     zbl = {0332.10013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__0286_0287_151773/}
}