Cryptology ePrint Archive: BibTeX Citation of Report 2013/852

@misc{cryptoeprint:2013:852,
    author = {Dongxia Bai and Hongbo Yu and Gaoli Wang and Xiaoyun Wang},
    title = {Improved Boomerang Attacks on Round-Reduced SM3 and BLAKE-256},
    howpublished = {Cryptology ePrint Archive, Report 2013/852},
    year = {2013},
    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.