%% You should probably cite rfc3126 instead of this I-D.
@techreport{ietf-smime-esformats-04,
    number =    {draft-ietf-smime-esformats-04},
    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-esformats/04/},
    author =    {Nick Pope and Denis Pinkas and John Ross},
    title =     {{Electronic Signature Formats for long term electronic signatures}},
    pagetotal = 84,
    year =      2001,
    month =     apr,
    day =       9,
    abstract =  {This document defines the format of an electronic signature that can remain valid over long periods. This includes evidence as to its validity even if the signer or verifying party later attempts to deny (i.e., repudiates the validity of the signature). This memo provides information for the Internet community.},
}