@article{DOCMA_2006__11__a13,
     author = {Gekeler, Ernst-Ulrich},
     title = {The distribution of group structures on elliptic curves over finite prime fields},
     journal = {Documenta mathematica},
     pages = {119--142},
     publisher = {mathdoc},
     volume = {11},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2006__11__a13/}
}