%% You should probably cite draft-ietf-pce-sr-bidir-path instead of this I-D.
@techreport{li-pce-sr-bidir-path-04,
    number =    {draft-li-pce-sr-bidir-path-04},
    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-sr-bidir-path/04/},
    author =    {Cheng Li and Mach Chen and Weiqiang Cheng and Zhenbin Li and Jie Dong and Rakesh Gandhi},
    title =     {{PCEP Extensions for Associated Bidirectional Segment Routing (SR) Paths}},
    pagetotal = 15,
    year =      2019,
    month =     mar,
    day =       11,
    abstract =  {The Path Computation Element Communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests.},
}