%% You should probably cite draft-chen-pce-h-sdns-03 instead of this revision.
@techreport{chen-pce-h-sdns-02,
    number =    {draft-chen-pce-h-sdns-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-chen-pce-h-sdns/02/},
    author =    {Huaimo Chen and Mehmet Toy and Lei Liu and Vic Liu},
    title =     {{PCE Hierarchical SDNs}},
    pagetotal = 66,
    year =      2017,
    month =     may,
    day =       4,
    abstract =  {This document presents extensions to the Path Computation Element Communication Protocol (PCEP) for supporting a hierarchical SDN control system, which comprises multiple SDN controllers controlling a network with a number of domains.},
}