@misc{cryptoeprint:2008:544,
    author = {*Yalin Chen 1, Chun-Hui Huang 2, Jue-Sam Chou3 },
    title = {Comments on two multi-server authentication protocols},
    howpublished = {Cryptology ePrint Archive, Report 2008/544},
    year = {2008},
    url = {http://eprint.iacr.org/2008/544},
}