@article{MZ_1990__205_3_174179,
     author = {G.P. Pirola and A. Alzati},
     title = {On abelian subvarieties generated by symmetric correspondences.},
     journal = {Mathematische Zeitschrift},
     pages = {333--342},
     publisher = {mathdoc},
     volume = {205},
     number = {3},
     year = {1990},
     zbl = {0685.14018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174179/}
}