%% You should probably cite rfc8779 instead of this I-D.
@techreport{ietf-pce-gmpls-pcep-extensions-12,
    number =    {draft-ietf-pce-gmpls-pcep-extensions-12},
    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-pcep-extensions/12/},
    author =    {Cyril Margaria and Oscar Gonzalez de Dios and Fatai Zhang},
    title =     {{PCEP extensions for GMPLS}},
    pagetotal = 36,
    year =      2018,
    month =     sep,
    day =       27,
    abstract =  {This memo provides extensions to the Path Computation Element communication Protocol (PCEP) for the support of GMPLS control plane.},
}