@article{MAN_1989__284_4_164555,
     author = {E. Kani and M. Rosen},
     title = {Idempotent relations and factors of {Jacobians.}},
     journal = {Mathematische Annalen},
     pages = {307--328},
     publisher = {mathdoc},
     volume = {284},
     number = {4},
     year = {1989},
     zbl = {0652.14011},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164555/}
}