@misc{cryptoeprint:2013:206,
    author = {Florian Kerschbaum and Hoon Wei Lim and Ivan Gudymenko},
    title = {Privacy-Preserving Billing for e-Ticketing Systems in Public Transportation},
    howpublished = {Cryptology ePrint Archive, Report 2013/206},
    year = {2013},
    url = {http://eprint.iacr.org/2013/206},
}