Cryptology ePrint Archive: BibTeX Citation of Report 2012/574

@misc{cryptoeprint:2012:574,
    author = {A. D. Myasnikov and A. Ushakov},
    title = {Quantum algorithm for the discrete logarithm problem for matrices over finite group rings},
    howpublished = {Cryptology ePrint Archive, Report 2012/574},
    year = {2012},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.