%% You should probably cite rfc8141 instead of this I-D.
@techreport{ietf-urnbis-rfc2141bis-urn-07,
    number =    {draft-ietf-urnbis-rfc2141bis-urn-07},
    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-urnbis-rfc2141bis-urn/07/},
    author =    {Peter Saint-Andre},
    title =     {{Uniform Resource Name (URN) Syntax}},
    pagetotal = 9,
    year =      2014,
    month =     jan,
    day =       24,
    abstract =  {A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that is intended to serve as a persistent, location-independent resource identifier. This document defines the canonical syntax for URIs under the "urn" scheme, guidelines for URN namespaces, requirements for URN presentation and transmission, and methods for determining URN equivalence. This document obsoletes RFC 2141.},
}