%% You should probably cite draft-ietf-bier-bierin6 instead of this I-D.
@techreport{zhang-bier-bierin6-02,
    number =    {draft-zhang-bier-bierin6-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-zhang-bier-bierin6/02/},
    author =    {Zheng Zhang and Tony Przygienda},
    title =     {{BIER in IPv6}},
    pagetotal = 5,
    year =      2018,
    month =     oct,
    day =       21,
    abstract =  {BIER is a new architecture for the forwarding of multicast data packets. This document defines native IPv6 encapsulation for BIER hop-by-hop forwarding or BIERin6 for short.},
}