%% You should probably cite rfc7597 instead of this I-D.
@techreport{ietf-softwire-map-01,
    number =    {draft-ietf-softwire-map-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-map/01/},
    author =    {Ole Trøan and Wojciech Dec and Xing Li and Congxiao Bao and Yu Zhai and Satoru Matsushima and Tetsuya Murakami},
    title =     {{Mapping of Address and Port (MAP)}},
    pagetotal = 33,
    year =      2012,
    month =     jun,
    day =       28,
    abstract =  {This document describes a mechanism for transporting IPv4 packets across an IPv6 network, and a generic mechanism for mapping between IPv6 addresses and IPv4 addresses and transport layer ports.},
}