@article{CMH_1973__48_139557,
     author = {Henrik H. Martens},
     title = {On the {Partial} {Derivatives} of {Thetafunctions}},
     journal = {Commentarii mathematici Helvetici},
     pages = {394--408},
     year = {1973},
     volume = {48},
     zbl = {0268.14013},
     url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139557/}
}