%% You should probably cite rfc3917 instead of this I-D.
@techreport{ietf-ipfix-reqs-16,
    number =    {draft-ietf-ipfix-reqs-16},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-ipfix-reqs/16/},
    author =    {Tanja Zseby and Benoît Claise and Juergen Quittek and Sebastian Zander},
    title =     {{Requirements for IP Flow Information Export (IPFIX)}},
    pagetotal = 33,
    year =      2004,
    month =     jun,
    day =       4,
    abstract =  {This memo defines requirements for the export of measured IP flow information out of routers, traffic measurement probes, and middleboxes. This memo provides information for the Internet community.},
}