%% You should probably cite draft-ribose-cfrg-sm4-10 instead of this revision.
@techreport{ribose-cfrg-sm4-06,
    number =    {draft-ribose-cfrg-sm4-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ribose-cfrg-sm4/06/},
    author =    {Ronald Henry Tse and Wong Wai Kit},
    title =     {{The SM4 Blockcipher Algorithm And Its Modes Of Operations}},
    pagetotal = 66,
    year =      2017,
    month =     dec,
    day =       1,
    abstract =  {This document describes the SM4 symmetric blockcipher algorithm published as GB/T 32907-2016 by the State Cryptography Administration of China (SCA). This document is a product of the Crypto Forum Research Group (CFRG).},
}