%% You should probably cite rfc7648 instead of this I-D.
@techreport{ietf-pcp-proxy-04,
    number =    {draft-ietf-pcp-proxy-04},
    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-pcp-proxy/04/},
    author =    {Mohamed Boucadair and Reinaldo Penno and Dan Wing},
    title =     {{Port Control Protocol (PCP) Proxy Function}},
    pagetotal = 11,
    year =      2013,
    month =     jul,
    day =       29,
    abstract =  {This document specifies a new PCP functional element denoted as a PCP Proxy. The PCP Proxy relays PCP requests received from PCP clients to upstream PCP server(s). A typical deployment usage of this function is to help establish successful PCP communications for PCP clients that can not be configured with the address of a PCP server located more than one hop away.},
}