%% You should probably cite draft-ietf-urnbis-rfc2141bis-urn instead of this I-D.
@techreport{ietf-urnbis-rfc3406bis-urn-ns-reg-05,
    number =    {draft-ietf-urnbis-rfc3406bis-urn-ns-reg-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-urnbis-rfc3406bis-urn-ns-reg/05/},
    author =    {Peter Saint-Andre and Leslie Daigle and Renato Iannella and Patrik Fältström},
    title =     {{Uniform Resource Name (URN) Namespace Definition Mechanisms}},
    pagetotal = 16,
    year =      2013,
    month =     feb,
    day =       20,
    abstract =  {This document supplements the Uniform Resource Name (URN) syntax specification by defining the concept of a URN namespace, as well as mechanisms for defining and registering such namespaces. This document obsoletes RFC 3406.},
}