%% You should probably cite rfc8676 instead of this I-D.
@techreport{ietf-softwire-yang-16,
    number =    {draft-ietf-softwire-yang-16},
    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/16/},
    author =    {Ian Farrer and Mohamed Boucadair},
    title =     {{YANG Modules for IPv4-in-IPv6 Address plus Port (A+P) Softwires}},
    pagetotal = 46,
    year =      2019,
    month =     jan,
    day =       29,
    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.},
}