@article{MAN_1962__147_160969,
     author = {F. OORT},
     title = {A construction of generalized {Jacobian} varieties by group extensions.},
     journal = {Mathematische Annalen},
     pages = {277--286},
     year = {1962},
     volume = {147},
     zbl = {0101.38502},
     url = {http://geodesic.mathdoc.fr/item/MAN_1962__147_160969/}
}