@article{AM2_1997__53_1-2_137677,
     author = {Mario Bonk},
     title = {The addition formula for theta functions.},
     journal = {Aequationes mathematicae},
     pages = {54--72},
     publisher = {mathdoc},
     volume = {53},
     number = {1-2},
     year = {1997},
     zbl = {0881.39016},
     url = {http://geodesic.mathdoc.fr/item/AM2_1997__53_1-2_137677/}
}