%% You should probably cite draft-ietf-pcp-nat64-prefix64 instead of this I-D.
@techreport{boucadair-pcp-nat64-prefix64-option-02,
    number =    {draft-boucadair-pcp-nat64-prefix64-option-02},
    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/02/},
    author =    {Mohamed Boucadair},
    title =     {{Learn NAT64 PREFIX64s using PCP}},
    pagetotal = 12,
    year =      2012,
    month =     sep,
    day =       12,
    abstract =  {This document defines a new PCP Option/OpCode to learn the Prefix64(s) used by a PCP-controlled NAT64 device to build IPv4- embedded IPv6 addresses. This Option/OpCode is needed for successful communications when IPv4 addresses are used in referrals (e.g., SIP).},
}