%% You should probably cite rfc2234 instead of this I-D.
@techreport{ietf-drums-abnf-04,
    number =    {draft-ietf-drums-abnf-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-drums-abnf/04/},
    author =    {Paul Overell and Dave Crocker},
    title =     {{Augmented BNF for Syntax Specifications: ABNF}},
    pagetotal = 14,
    year =      1997,
    month =     sep,
    day =       29,
    abstract =  {In the early days of the Arpanet, each specification contained its own definition of ABNF. This included the email specifications, RFC733 and then RFC822 which have come to be the common citations for defining ABNF. The current document separates out that definition, to permit selective reference. Predictably, it also provides some modifications and enhancements. {[}STANDARDS-TRACK{]}},
}