%% You should probably cite rfc2112 instead of this I-D.
@techreport{ietf-mhtml-related-00,
    number =    {draft-ietf-mhtml-related-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-mhtml-related/00/},
    author =    {Dr. Ed Levinson},
    title =     {{The MIME Multipart/Related Content-type}},
    pagetotal = 9,
    year =      1996,
    month =     may,
    day =       14,
    abstract =  {The Multipart/Related content-type provides a common mechanism for representing objects that are aggregates of related MIME body parts. This document defines the Multipart/Related content-type and provides examples of its use. {[}STANDARDS-TRACK{]}},
}