@article{JRAM_1891__107_148795,
     author = {F. Schottky},
     title = {Zur {Definition} des {Systems} der {4Q} geraden und ungeraden {Thetafunctionen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {117--134},
     publisher = {mathdoc},
     volume = {107},
     year = {1891},
     zbl = {22.0495.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1891__107_148795/}
}