%% You should probably cite rfc8515 instead of this I-D.
@techreport{mahesh-etsi-urn-01,
    number =    {draft-mahesh-etsi-urn-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-mahesh-etsi-urn/01/},
    author =    {Mahesh Jethanandani and Miguel Angel Reina Ortega},
    title =     {{URN Namespace for ETSI Documents}},
    pagetotal = 5,
    year =      2018,
    month =     may,
    day =       25,
    abstract =  {This document describes the Namespace Identifier (NID) 'etsi' for Uniform Resource Names (URNs) used to identify resources published by European Telecommuncations Standards Instititue (http://etsi.org). ETSI specifies and manages resources that utilize this URN identification model. Management activities for these and other resources types are handled by the manager of the ETSI Protocol Naming and Numbering Service (PNNS).},
}