%% You should probably cite draft-chen-pce-h-discovery-15 instead of this revision.
@techreport{chen-pce-h-discovery-04,
    number =    {draft-chen-pce-h-discovery-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-chen-pce-h-discovery/04/},
    author =    {Huaimo Chen and Mehmet Toy and Xufeng Liu and Lei Liu and Zhenqiang Li},
    title =     {{Hierarchical PCE Determination}},
    pagetotal = 11,
    year =      2018,
    month =     mar,
    day =       5,
    abstract =  {This document presents extensions to the Path Computation Element Communication Protocol (PCEP) for determining parent child relations and exchanging the information between a parent and a child PCE in a hierarchical PCE system.},
}