%% You should probably cite rfc5917 instead of this I-D.
@techreport{turner-clearancesponsor-attribute-03,
    number =    {draft-turner-clearancesponsor-attribute-03},
    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-clearancesponsor-attribute/03/},
    author =    {Sean Turner},
    title =     {{Clearance Sponsor Attribute}},
    pagetotal = 7,
    year =      2010,
    month =     feb,
    day =       1,
    abstract =  {This document defines the clearance sponsor attribute. It indicates the entity that sponsored (i.e., granted) the clearance. This attribute is intended for use in public key certificates and attribute certificates that also include the clearance attribute. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}