@article{CM_1986__58_1_133_0, author = {Frey, Gerhard}, title = {A remark about isogenies of elliptic curves over quadratic fields}, journal = {Compositio Mathematica}, volume = {60}, year = {1986}, pages = {133-134}, mrnumber = {834050}, zbl = {0596.14021}, language = {en}, url = {http://dml.mathdoc.fr/item/CM_1986__58_1_133_0} }
Frey, Gerhard. A remark about isogenies of elliptic curves over quadratic fields. Compositio Mathematica, Tome 60 (1986) pp. 133-134. http://gdmltest.u-ga.fr/item/CM_1986__58_1_133_0/
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