%% You should probably cite rfc8115 instead of this I-D.
@techreport{ietf-softwire-multicast-prefix-option-12,
    number =    {draft-ietf-softwire-multicast-prefix-option-12},
    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-multicast-prefix-option/12/},
    author =    {Mohamed Boucadair and Jacni Qin and Tina Tsou (Ting ZOU) and Xiaohong Deng},
    title =     {{DHCPv6 Option for IPv4-Embedded Multicast and Unicast IPv6 Prefixes}},
    pagetotal = 8,
    year =      2017,
    month =     jan,
    day =       12,
    abstract =  {This document defines a Dynamic Host Configuration Protocol version 6 (DHCPv6) Option for multicast IPv4 service continuity solutions, which is used to carry the IPv6 prefixes to be used to build unicast and multicast IPv4-embedded IPv6 addresses.},
}