%% You should probably cite draft-li-pce-multicast instead of this I-D.
@techreport{li-pce-based-bier-01,
    number =    {draft-li-pce-based-bier-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-li-pce-based-bier/01/},
    author =    {Huanan Li and Aijun Wang and Huaimo Chen and Ran Chen},
    title =     {{PCE based BIER Procedures and Protocol Extensions}},
    pagetotal = 18,
    year =      2021,
    month =     jul,
    day =       12,
    abstract =  {This document describes extensions to Path Computation Element (PCE) communication Protocol (PCEP) for supporting the PCE based Bit Index Explicit Replication (BIER) deployment.},
}