%% You should probably cite rfc2912 instead of this I-D.
@techreport{ietf-conneg-content-features-03,
    number =    {draft-ietf-conneg-content-features-03},
    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-conneg-content-features/03/},
    author =    {Graham Klyne},
    title =     {{Indicating Media Features for MIME Content}},
    pagetotal = 11,
    year =      2000,
    month =     apr,
    day =       12,
    abstract =  {This memo defines a Multipurpose Internet Mail Extensions (MIME) ' Content-features:' header that can be used to annotate a MIME message part using this expression format, and indicates some ways it might be used. {[}STANDARDS-TRACK{]}},
}