@article{JRAM_1982__331_152418,
     author = {Ken Nakamula},
     title = {Class number calculation of a cubic field from the elliptic unit.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {114--123},
     year = {1982},
     volume = {331},
     zbl = {0472.12003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1982__331_152418/}
}