%% You should probably cite rfc2160 instead of this I-D.
@techreport{ietf-mixer-postscript-00,
    number =    {draft-ietf-mixer-postscript-00},
    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-mixer-postscript/00/},
    author =    {Harald T. Alvestrand},
    title =     {{Carrying PostScript in X.400 and MIME}},
    pagetotal = 5,
    year =      1996,
    month =     jan,
    day =       5,
    abstract =  {This document describes methods for carrying PostScript information in the two standard mail systems MIME and X.400, and the conversion between them. {[}STANDARDS-TRACK{]}},
}