%% You should probably cite rfc8401 instead of this I-D.
@techreport{ietf-bier-isis-extensions-00,
    number =    {draft-ietf-bier-isis-extensions-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-ietf-bier-isis-extensions/00/},
    author =    {Les Ginsberg and Sam Aldrin and Zhaohui (Jeffrey) Zhang and Tony Przygienda},
    title =     {{BIER support via ISIS}},
    pagetotal = 12,
    year =      2015,
    month =     apr,
    day =       28,
    abstract =  {Specification of an ISIS extension to support BIER domains and sub- domains.},
}