Cryptology ePrint Archive: BibTeX Citation of Report 2013/193

@misc{cryptoeprint:2013:193,
    author = {Yu-Chi Chen and Raylin Tso and Willy Susilo and Xinyi Huang and Gwoboa Horng},
    title = {Certificateless Signatures: Structural Extensions of Security Models and New Provably Secure Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2013/193},
    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.