@article{10_4064_aa117_4_2,
     author = {J\"orn Steuding and Annegret Weng},
     title = {On the number of prime divisors
 of the order of elliptic curves modulo $p$},
     journal = {Acta Arithmetica},
     pages = {341--352},
     publisher = {mathdoc},
     volume = {117},
     number = {4},
     year = {2005},
     doi = {10.4064/aa117-4-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa117-4-2/}
}