%% You should probably cite rfc2015 instead of this I-D.
@techreport{elkins-pem-pgp-04,
    number =    {draft-elkins-pem-pgp-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-elkins-pem-pgp/04/},
    author =    {Michael Elkins},
    title =     {{MIME Security with Pretty Good Privacy (PGP)}},
    pagetotal = 8,
    year =      1996,
    month =     jun,
    day =       7,
    abstract =  {This document describes how Pretty Good Privacy (PGP) can be used to provide privacy and authentication using the Multipurpose Internet Mail Extensions (MIME) security content types described in RFC1847. {[}STANDARDS-TRACK{]}},
}