%% You should probably cite draft-ietf-nvo3-yang-cfg instead of this I-D.
@techreport{zhang-nvo3-yang-cfg-04,
    number =    {draft-zhang-nvo3-yang-cfg-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-zhang-nvo3-yang-cfg/04/},
    author =    {Mingui Zhang and Yuan Gao and Haibo Wang and Fu Qiao},
    title =     {{YANG Data Model for NVO3 Protocols}},
    pagetotal = 23,
    year =      2018,
    month =     dec,
    day =       18,
    abstract =  {This document describes the base YANG data model that can be used by operators to configure and manage NVO3 protocols.},
}