%% You should probably cite rfc2772 instead of this I-D.
@techreport{ietf-ngtrans-harden-04,
    number =    {draft-ietf-ngtrans-harden-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-ngtrans-harden/04/},
    author =    {Bill Fink and Robert Rockell},
    title =     {{6Bone Backbone Routing Guidelines}},
    pagetotal = 14,
    year =      1999,
    month =     dec,
    day =       21,
    abstract =  {This document provides a set of guidelines for all 6bone routing equipment operators to use as a reference for efficient and stable deployment of 6bone routing systems. This memo provides information for the Internet community.},
}