@misc{cryptoeprint:2014:505,
    author = {David Kohel, Kristin Lauter, Christophe Petit, Jean-Pierre Tignol},
    title = {On the quaternion $\ell$-isogeny path problem},
    howpublished = {Cryptology ePrint Archive, Report 2014/505},
    year = {2014},
    url = {https://eprint.iacr.org/2014/505},
}