%% You should probably cite rfc3850 instead of this I-D.
@techreport{ietf-smime-rfc2632bis-07,
    number =    {draft-ietf-smime-rfc2632bis-07},
    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-rfc2632bis/07/},
    author =    {Blake C. Ramsdell},
    title =     {{Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Certificate Handling}},
    pagetotal = 16,
    year =      2004,
    month =     jun,
    day =       4,
    abstract =  {This document specifies conventions for X.509 certificate usage by Secure/Multipurpose Internet Mail Extensions (S/MIME) agents. S/MIME provides a method to send and receive secure MIME messages, and certificates are an integral part of S/MIME agent processing. S/MIME agents validate certificates as described in RFC 3280, the Internet X.509 Public Key Infrastructure Certificate and CRL Profile. S/MIME agents must meet the certificate processing requirements in this document as well as those in RFC 3280. {[}STANDARDS-TRACK{]}},
}