@article{IM_1985__79_143215,
     author = {H. Lange and W. Ruppert},
     title = {Complete systems of addition laws on {Abelian} varieties.},
     journal = {Inventiones mathematicae},
     pages = {603--610},
     publisher = {mathdoc},
     volume = {79},
     year = {1985},
     zbl = {0577.14035},
     url = {http://geodesic.mathdoc.fr/item/IM_1985__79_143215/}
}