@article{JRAM_1990__407_153234,
     author = {H. Lange and Ch. Birkenhake},
     title = {Cubic theta relations.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {167--177},
     publisher = {mathdoc},
     volume = {407},
     year = {1990},
     zbl = {0727.14025},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__407_153234/}
}