Cryptology ePrint Archive: BibTeX Citation of Report 2015/972

@misc{cryptoeprint:2015:972,
    author = {David Pointcheval and Olivier Sanders and Jacques Traoré},
    title = {Cut Down the Tree to Achieve Constant Complexity in Divisible E-Cash},
    howpublished = {Cryptology ePrint Archive, Report 2015/972},
    year = {2015},
    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.