%% You should probably cite rfc1873 instead of this I-D.
@techreport{ietf-mimesgml-access-cid-00,
    number =    {draft-ietf-mimesgml-access-cid-00},
    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-mimesgml-access-cid/00/},
    author =    {James Clark and Dr. Ed Levinson},
    title =     {{Message/External-Body Content-ID Access Type}},
    pagetotal = 4,
    year =      1995,
    month =     may,
    day =       31,
    abstract =  {The existing MIME Content-Type Message/External-Body access-types allow a MIME entity (body-part) to refer to an object that is not in the message by specifying how to access that object. The Content-ID access method described in this document provides the capability to refer to an object within the message. This memo defines an Experimental Protocol for the Internet community.},
}