Cryptology ePrint Archive: BibTeX Citation of Report 2006/249

@misc{cryptoeprint:2006:249,
    author = {Selcuk Kavut and Subhamoy Maitra and Sumanta Sarkar and  Melek D. Yucel},
    title = {Enumeration of 9-variable Rotation Symmetric Boolean Functions having Nonlinearity > 240},
    howpublished = {Cryptology ePrint Archive, Report 2006/249},
    year = {2006},
    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.