%% You should probably cite rfc2312 instead of this I-D.
@techreport{dusse-smime-cert-05,
    number =    {draft-dusse-smime-cert-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-dusse-smime-cert/05/},
    author =    {Blake C. Ramsdell and Jeff Weinstein and Paul E. Hoffman and Steve Dusse},
    title =     {{S/MIME Version 2 Certificate Handling}},
    pagetotal = 20,
    year =      1997,
    month =     nov,
    day =       10,
    abstract =  {This memo describes the mechanisms S/MIME uses to create and validate keys using certificates. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.},
}