%% You should probably cite rfc3839 instead of this I-D.
@techreport{singer-avt-3gpp-mime-01,
    number =    {draft-singer-avt-3gpp-mime-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-singer-avt-3gpp-mime/01/},
    author =    {Roberto Castagno and David Singer},
    title =     {{MIME Type Registrations for 3rd Generation Partnership Project (3GPP) Multimedia files}},
    pagetotal = 7,
    year =      2003,
    month =     sep,
    day =       11,
    abstract =  {This document serves to register and document the standard MIME types associated with the 3GPP multimedia file format, which is part of the family based on the ISO Media File Format. {[}STANDARDS-TRACK{]}},
}