%% You should probably cite rfc9272 instead of this I-D.
@techreport{ietf-bier-bar-ipa-08,
    number =    {draft-ietf-bier-bar-ipa-08},
    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-bier-bar-ipa/08/},
    author =    {Zhaohui (Jeffrey) Zhang and Tony Przygienda and Andrew Dolganow and Hooman Bidgoli and IJsbrand Wijnands and Arkadiy Gulko},
    title =     {{BIER Underlay Path Calculation Algorithm and Constraints}},
    pagetotal = 6,
    year =      2021,
    month =     sep,
    day =       29,
    abstract =  {This document specifies general rules for the interaction between the BIER Algorithm (BAR) and the IGP Algorithm (IPA) used for underlay path calculation. The semantics defined in this document update RFC8401, RFC8444, and draft-ietf-bier-ospfv3-extensions.},
}