%% You should probably cite rfc9272 instead of this I-D.
@techreport{ietf-bier-bar-ipa-01,
    number =    {draft-ietf-bier-bar-ipa-01},
    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/01/},
    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 Contraints}},
    pagetotal = 6,
    year =      2018,
    month =     apr,
    day =       11,
    abstract =  {This document specifies general rules for interaction between the BAR and IPA fields defined in {[}I-D.ietf-bier-isis-extensions{]} and {[}I-D.ietf-bier-ospf-bier-extensions{]}.},
}