%% You should probably cite rfc7600 instead of this I-D.
@techreport{ietf-softwire-4rd-05,
    number =    {draft-ietf-softwire-4rd-05},
    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-softwire-4rd/05/},
    author =    {Rémi Després and Sheng Jiang and Reinaldo Penno and Yiu Lee and Gang Chen and Maoke Chen},
    title =     {{IPv4 Residual Deployment via IPv6 - a Stateless Solution (4rd)}},
    pagetotal = 40,
    year =      2013,
    month =     apr,
    day =       25,
    abstract =  {The 4rd automatic tunneling mechanism makes IPv4 Residual Deployment possible via IPv6 networks without maintaining for this per-customer states in 4rd-capable nodes (reverse of the IPv6 Rapid Deployment of 6rd). To cope with the IPv4 address shortage, customer sites can be assigned shared public IPv4 addresses with restricted port sets. 4rd can also support the scenarios that customer sites are assigned full public IPv4 addresses or a set of public IPv4 addresses.},
}