%% You should probably cite rfc8141 instead of this I-D.
@techreport{ietf-urnbis-rfc2141bis-urn-12,
    number =    {draft-ietf-urnbis-rfc2141bis-urn-12},
    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/12/},
    author =    {Peter Saint-Andre and Dr. John C. Klensin},
    title =     {{Uniform Resource Names (URNs)}},
    pagetotal = 30,
    year =      2015,
    month =     jun,
    day =       15,
    abstract =  {A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that is assigned under the "urn" scheme and a particular URN namespace, with the intent that the URN will be either a persistent, location-independent resource identifier or in some cases an abstract designator that is persistent but that does not identify a resource. With regard to URN syntax, this document defines the canonical syntax for URNs (in a way that is consistent with URI syntax), specifies methods for determining URN equivalence, and discusses URI conformance. With regard to URN namespaces, this document specifies a method for defining a URN namespace and associating it with a namespace identifier, and describes procedures for registering namespace identifiers with the Internet Assigned Numbers Authority (IANA). This document obsoletes both RFC 2141 and RFC 3406.},
}