%% You should probably cite rfc2311 instead of this I-D.
@techreport{dusse-smime-msg-06,
    number =    {draft-dusse-smime-msg-06},
    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-msg/06/},
    author =    {Lisa Repka and Blake C. Ramsdell and Laurence Lundblade and Paul E. Hoffman and Steve Dusse},
    title =     {{S/MIME Version 2 Message Specification}},
    pagetotal = 37,
    year =      1997,
    month =     nov,
    day =       10,
    abstract =  {This document describes a protocol for adding cryptographic signature and encryption services to MIME data. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.},
}