@article{JTNB_2008__20_3_783_0,
     author = {Lercier, Reynald and Sirvent, Thomas},
     title = {On {Elkies} subgroups of $\ell $-torsion points in elliptic curves defined over a finite field},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {783--797},
     publisher = {Universit\'e Bordeaux 1},
     volume = {20},
     number = {3},
     year = {2008},
     doi = {10.5802/jtnb.650},
     mrnumber = {2523317},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jtnb.650/}
}