%% You should probably cite rfc8401 instead of this I-D.
@techreport{ietf-bier-isis-extensions-11,
    number =    {draft-ietf-bier-isis-extensions-11},
    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/11/},
    author =    {Les Ginsberg and Tony Przygienda and Sam Aldrin and Zhaohui (Jeffrey) Zhang},
    title =     {{Bit Index Explicit Replication (BIER) Support via IS-IS}},
    pagetotal = 12,
    year =      2018,
    month =     mar,
    day =       30,
    abstract =  {This document defines IS-IS extensions to support multicast forwarding using the Bit Index Explicit Replication (BIER) architecture.},
}