%% You should probably cite rfc3855 instead of this I-D.
@techreport{ietf-smime-x400transport-09,
    number =    {draft-ietf-smime-x400transport-09},
    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-smime-x400transport/09/},
    author =    {Paul E. Hoffman and Chistopher Bonatti},
    title =     {{Transporting Secure/Multipurpose Internet Mail Extensions (S/MIME) Objects in X.400}},
    pagetotal = 12,
    year =      2003,
    month =     aug,
    day =       8,
    abstract =  {This document describes protocol options for conveying objects that have been protected using the Cryptographic Message Syntax (CMS) and Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.1 over an X.400 message transfer system. {[}STANDARDS-TRACK{]}},
}