%% You should probably cite rfc7281 instead of this I-D.
@techreport{melnikov-authentication-results-smime-03,
    number =    {draft-melnikov-authentication-results-smime-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-melnikov-authentication-results-smime/03/},
    author =    {Alexey Melnikov},
    title =     {{Authentication-Results Registration for S/MIME signature verification}},
    pagetotal = 7,
    year =      2013,
    month =     oct,
    day =       11,
    abstract =  {RFC 7001 specifies the Authentication-Results header field for conveying results of message authentication checks. This document defines a new authentication method to be used in the Authentication- Results header field for S/MIME related signature checks.},
}