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@article{MAN_1975__214_162679, author = {Frans Oort}, title = {Which {Abelian} {Surfaces} are {Products} of {Elliptic} {Curves} ?}, journal = {Mathematische Annalen}, pages = {35--48}, publisher = {mathdoc}, volume = {214}, year = {1975}, zbl = {0283.14007}, url = {http://geodesic.mathdoc.fr/item/MAN_1975__214_162679/} }
Frans Oort. Which Abelian Surfaces are Products of Elliptic Curves ?. Mathematische Annalen, Tome 214 (1975), pp. 35-48. http://geodesic.mathdoc.fr/item/MAN_1975__214_162679/