%% You should probably cite draft-ietf-bier-tether instead of this I-D.
@techreport{zzhang-bier-tether-00,
    number =    {draft-zzhang-bier-tether-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-zzhang-bier-tether/00/},
    author =    {Zhaohui (Jeffrey) Zhang and Nils Warnke and IJsbrand Wijnands},
    title =     {{Tethering A BIER Router To A BIER-incapable Router}},
    pagetotal = 7,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document specifies optional procedures to optimize the handling of Bit Index Explicit Replication (BIER) {[}RFC8279{]} incapable routers, by tethering a BIER router to a BIER incapable router.},
}