%% You should probably cite rfc8675 instead of this I-D.
@techreport{ietf-softwire-iftunnel-02,
    number =    {draft-ietf-softwire-iftunnel-02},
    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-iftunnel/02/},
    author =    {Mohamed Boucadair and Ian Farrer and Rajiv Asati},
    title =     {{Tunnel Interface Types YANG Module}},
    pagetotal = 15,
    year =      2019,
    month =     jan,
    day =       15,
    abstract =  {This document specifies a YANG module containing a collection of IANA maintained YANG identities, used as interface types for tunnel interfaces.},
}