%% You should probably cite draft-ietf-l2tpext-tdm instead of this I-D.
@techreport{ieft-l2tpext-tdm-03,
    number =    {draft-ieft-l2tpext-tdm-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-ieft-l2tpext-tdm/03/},
    author =    {Sasha Vainshtein and Sharon Galtzur},
    title =     {{Layer Two Tunneling Protocol - Setup of TDM Pseudowires}},
    pagetotal = 8,
    year =      2007,
    month =     mar,
    day =       5,
    abstract =  {This document defines extensions to the Layer Two Tunneling Protocol (L2TP) for support of structure-agnostic {[}RFC4553{]} and structure- aware {[}PWE3-CESoPSN{]} pseudowires.},
}