%0 Journal Article %A A. Libgober %T Factors of Jacobians and isotrivial elliptic surfaces %J Journal of Singularities %D 2012 %P 115-123 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.5427/jsing.2012.5i/ %R 10.5427/jsing.2012.5i %F 10_5427_jsing_2012_5i