%% You should probably cite rfc2141 instead of this I-D.
@techreport{ietf-urn-syntax-05,
    number =    {draft-ietf-urn-syntax-05},
    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-urn-syntax/05/},
    author =    {Ryan Moats},
    title =     {{URN Syntax}},
    pagetotal = 8,
    year =      1997,
    month =     mar,
    day =       19,
    abstract =  {Uniform Resource Names (URNs) are intended to serve as persistent, location-independent, resource identifiers. This document sets forward the canonical syntax for URNs. {[}STANDARDS-TRACK{]}},
}