%% You should probably cite draft-ietf-pce-stateful-pce-optional instead of this I-D.
@techreport{dhody-pce-stateful-pce-optional-03,
    number =    {draft-dhody-pce-stateful-pce-optional-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-dhody-pce-stateful-pce-optional/03/},
    author =    {Cheng Li and Haomian Zheng and Stephane Litkowski},
    title =     {{Extension for Stateful PCE to allow Optional Processing of PCEP Objects.}},
    pagetotal = 11,
    year =      2019,
    month =     mar,
    day =       5,
    abstract =  {This document introduces a mechanism to mark some Path Computation Element (PCE) Communication Protocol (PCEP) objects as optional during PCEP messages exchange for the Stateful PCE model to allow relaxing some constraints.},
}