%% You should probably cite draft-ietf-netmod-rfc6991-bis instead of this I-D.
@techreport{schoenw-netmod-rfc6991-bis-01,
    number =    {draft-schoenw-netmod-rfc6991-bis-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-schoenw-netmod-rfc6991-bis/01/},
    author =    {Jürgen Schönwälder},
    title =     {{Common YANG Data Types}},
    pagetotal = 44,
    year =      2019,
    month =     mar,
    day =       11,
    abstract =  {This document introduces a collection of common data types to be used with the YANG data modeling language. This document obsoletes RFC 6991.},
}