%% You should probably cite draft-ietf-pcp-nat64-prefix64 instead of this I-D.
@techreport{boucadair-pcp-nat64-prefix64-option-00,
    number =    {draft-boucadair-pcp-nat64-prefix64-option-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-boucadair-pcp-nat64-prefix64-option/00/},
    author =    {Mohamed Boucadair},
    title =     {{PREFIX64 PCP Option for NAT64}},
    pagetotal = 8,
    year =      2012,
    month =     sep,
    day =       6,
    abstract =  {This document defines a new PCP option to learn the Prefix64 used by a PCP-controlled NAT64 device to build IPv4-embedded IPv6 addresses. This option is needed for successful communications when IPv4 addresses are used in referrals (e.g., SIP).},
}