%% You should probably cite draft-ietf-pce-flexible-grid instead of this I-D.
@techreport{lee-pce-flexible-grid-01,
    number =    {draft-lee-pce-flexible-grid-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-lee-pce-flexible-grid/01/},
    author =    {Young Lee and Haomian Zheng and Ramon Casellas and Ricard Vilalta and Daniele Ceccarelli and Francesco Lazzeri},
    title =     {{PCEP Extension for Flexible Grid Networks}},
    pagetotal = 20,
    year =      2017,
    month =     dec,
    day =       27,
    abstract =  {This document provides the Path Computation Element Communication Protocol (PCEP) extensions for the support of Routing and Spectrum Assignment (RSA) in Flexible Grid networks.},
}