@misc{cryptoeprint:2009:393,
    author = {Rajesh P Singh and  Soumen Maity},
    title = {Permutation Polynomials modulo $p^n$}},
    howpublished = {Cryptology ePrint Archive, Report 2009/393},
    year = {2009},
    url = {http://eprint.iacr.org/2009/393},
}