%% You should probably cite rfc7025 instead of this I-D.
@techreport{ietf-pce-gmpls-aps-req-09,
    number =    {draft-ietf-pce-gmpls-aps-req-09},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-aps-req/09/},
    author =    {Tomohiro Otani and Kenichi Ogaki and Diego Caviglia and Fatai Zhang and Cyril Margaria},
    title =     {{Requirements for GMPLS Applications of PCE}},
    pagetotal = 12,
    year =      2013,
    month =     jul,
    day =       22,
    abstract =  {The initial effort of the PCE (Path Computation Element) WG focused mainly on MPLS. As a next step, this document describes functional requirements for GMPLS applications of PCE.},
}