@misc{cryptoeprint:2019:490,
    author = {Ward Beullens},
    title = {On sigma protocols with helper for MQ and PKP, fishy signature schemes and more},
    howpublished = {Cryptology ePrint Archive, Report 2019/490},
    year = {2019},
    url = {https://eprint.iacr.org/2019/490},
}