%% You should probably cite draft-dreibholz-ipv4-flowlabel-39 instead of this revision.
@techreport{dreibholz-ipv4-flowlabel-33,
    number =    {draft-dreibholz-ipv4-flowlabel-33},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-dreibholz-ipv4-flowlabel/33/},
    author =    {Thomas Dreibholz},
    title =     {{An IPv4 Flowlabel Option}},
    pagetotal = 9,
    year =      2021,
    month =     mar,
    day =       13,
    abstract =  {This draft defines an IPv4 option containing a flowlabel that is compatible to IPv6. It is required for simplified usage of IntServ and interoperability with IPv6.},
}