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@article{MM2_1996__91_3_156217, author = {Joseph H. Silverman and Armand Brumer}, title = {The number of elliptic curves over {Q} with conductor {N.}}, journal = {Manuscripta mathematica}, pages = {95--102}, publisher = {mathdoc}, volume = {91}, number = {3}, year = {1996}, zbl = {0868.11029}, url = {http://geodesic.mathdoc.fr/item/MM2_1996__91_3_156217/} }
Joseph H. Silverman; Armand Brumer. The number of elliptic curves over Q with conductor N.. Manuscripta mathematica, Tome 91 (1996) no. 3, pp. 95-102. http://geodesic.mathdoc.fr/item/MM2_1996__91_3_156217/