@misc{cryptoeprint:2017:575,
    author = {Ehsan Ebrahimi  and Dominique Unruh},
    title = {Quantum Collision-Resistance of Non-uniformly Distributed Functions: Upper and Lower  Bounds},
    howpublished = {Cryptology ePrint Archive, Report 2017/575},
    year = {2017},
    url = {https://eprint.iacr.org/2017/575},
}