%% You should probably cite rfc1496 instead of this I-D.
@techreport{ietf-mimemhs-harpoon-02,
    number =    {draft-ietf-mimemhs-harpoon-02},
    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-mimemhs-harpoon/02/},
    author =    {Harald T. Alvestrand and Kevin E. Jordan and Jim Romaguera},
    title =     {{Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages}},
    pagetotal = 5,
    year =      1993,
    month =     jun,
    day =       24,
    abstract =  {This document describes how RFC-1328 must be modified in order to provide adequate support for the scenarios: It replaces chapter 6 of RFC-1328. The rest of RFC-1328 is NOT obsoleted. {[}STANDARDS-TRACK{]}},
}