%% You should probably cite rfc8676 instead of this I-D.
@techreport{ietf-softwire-yang-12,
    number =    {draft-ietf-softwire-yang-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-yang/12/},
    author =    {Yong Cui and Ian Farrer and Mohamed Boucadair and Qi Sun and Linhui Sun and Sladjana Zechlin and Rajiv Asati},
    title =     {{YANG Modules for IPv4-in-IPv6 Address plus Port (A+P) Softwires}},
    pagetotal = 56,
    year =      2018,
    month =     nov,
    day =       4,
    abstract =  {This document defines YANG modules for the configuration and operation of IPv4-in-IPv6 softwire Border Relays and Customer Premises Equipment for the Lightweight 4over6, Mapping of Address and Port with Encapsulation (MAP-E), and Mapping of Address and Port using Translation (MAP-T) softwire mechanisms. It also contains the initial version of an IANA-maintained YANG module identifying tunnel types. Editorial Note (To be removed by RFC Editor) Please update these statements within this document with the RFC number to be assigned to this document: o "This version of this YANG module is part of RFC XXXX;" o "RFC XXXX: YANG Modules for IPv4-in-IPv6 Address plus Port Softwires"; o "reference: RFC XXXX" Please update the "revision" date of the YANG modules.},
}