@misc{cryptoeprint:2016:333,
    author = {Ling Ren and Srinivas Devadas},
    title = {Proof of Space from Stacked Expanders},
    howpublished = {Cryptology ePrint Archive, Report 2016/333},
    year = {2016},
    url = {https://eprint.iacr.org/2016/333},
}