%% You should probably cite rfc8026 instead of this I-D.
@techreport{ietf-softwire-unified-cpe-01,
    number =    {draft-ietf-softwire-unified-cpe-01},
    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-unified-cpe/01/},
    author =    {Mohamed Boucadair and Ian Farrer and Simon Perreault and Senthil Sivakumar},
    title =     {{Unified IPv4-in-IPv6 Softwire CPE}},
    pagetotal = 15,
    year =      2013,
    month =     may,
    day =       30,
    abstract =  {Transporting IPv4 packets encapsulated in IPv6 is a common solution to the problem of IPv4 service continuity over IPv6-only provider networks. A number of differing functional approaches have been developed for this, each having their own specific characteristics. As these approaches share a similar functional architecture and use the same data plane mechanisms, this memo describes a specification whereby a single CPE can interwork with all of the standardized and proposed approaches to providing encapsulated IPv4 in IPv6 services.},
}