%% You should probably cite rfc7093 instead of this I-D.
@techreport{turner-additional-methods-4kis-09,
    number =    {draft-turner-additional-methods-4kis-09},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-turner-additional-methods-4kis/09/},
    author =    {Sean Turner and Stephen Kent and James Manger},
    title =     {{Additional Methods for Generating Subject Key Identifiers}},
    pagetotal = 5,
    year =      2013,
    month =     aug,
    day =       27,
    abstract =  {This document specifies additional example methods for generating Key Identifier values for use in the AKI (Authority Key Identifier) and SKI (Subject Key Identifier).},
}