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@article{CM_1990__73_1_107_0, author = {Crew, Richard}, title = {Universal extensions and $p$-adic periods of elliptic curves}, journal = {Compositio Mathematica}, pages = {107--119}, publisher = {Kluwer Academic Publishers}, volume = {73}, number = {1}, year = {1990}, mrnumber = {1042455}, zbl = {0742.14013}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1990__73_1_107_0/} }
Crew, Richard. Universal extensions and $p$-adic periods of elliptic curves. Compositio Mathematica, Tome 73 (1990) no. 1, pp. 107-119. http://geodesic.mathdoc.fr/item/CM_1990__73_1_107_0/