%% You should probably cite draft-li-pce-based-bier instead of this I-D.
@techreport{li-pce-pcep-extension-multicast-management-00,
    number =    {draft-li-pce-pcep-extension-multicast-management-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-li-pce-pcep-extension-multicast-management/00/},
    author =    {Huanan Li and Aijun Wang and Huaimo Chen and Chun Zhu},
    title =     {{PCEP Extension for Multicast Management}},
    pagetotal = 13,
    year =      2021,
    month =     may,
    day =       23,
    abstract =  {This document describes extensions to Path Computation Element (PCE) communication Protocol (PCEP) for supporting multicast service management.},
}