%% You should probably cite rfc8676 instead of this I-D.
@techreport{ietf-softwire-yang-01,
    number =    {draft-ietf-softwire-yang-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-yang/01/},
    author =    {Qi Sun and Hao Wang and Yong Cui and Ian Farrer and Sladjana Zoric and Mohamed Boucadair and Rajiv Asati},
    title =     {{A YANG Data Model for IPv4-in-IPv6 Softwires}},
    pagetotal = 32,
    year =      2016,
    month =     oct,
    day =       31,
    abstract =  {This document defines a YANG data model for the configuration and operations (state, notification, RPC etc.) of IPv4-in-IPv6 Softwire Border Routers and Customer Premises Equipment. The model covers the Lightweight 4over6, MAP-E and MAP-T Softwire mechanisms.},
}