@misc{cryptoeprint:2007:251,
    author = {V{\'e}ronique Cortier and  Ralf Kuesters and Bogdan Warinschi},
    title = {A Cryptographic Model for Branching Time Security Properties -- the Case of Contract Signing Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2007/251},
    year = {2007},
    url = {http://eprint.iacr.org/2007/251},
}