%% You should probably cite draft-ietf-pce-association-diversity instead of this I-D.
@techreport{litkowski-pce-association-diversity-01,
    number =    {draft-litkowski-pce-association-diversity-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-litkowski-pce-association-diversity/01/},
    author =    {Stephane Litkowski and Siva Sivabalan and Colby Barth},
    title =     {{Path Computation Element communication Protocol extension for signaling LSP diversity constraint}},
    pagetotal = 11,
    year =      2016,
    month =     nov,
    day =       23,
    abstract =  {This document introduces a simple mechanism to signal path diversity for a group of Label Switched Paths (LSPs) via an extension to the Path Computation Element Communication Protocol (PCEP).},
}