%% You should probably cite draft-sakimura-oauth-jpop instead of this I-D.
@techreport{sakimura-oauth-rjwtprof-03,
    number =    {draft-sakimura-oauth-rjwtprof-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-sakimura-oauth-rjwtprof/03/},
    author =    {Nat Sakimura},
    title =     {{Sender Constrained JWT for OAuth 2.0}},
    pagetotal = 5,
    year =      2015,
    month =     mar,
    day =       25,
    abstract =  {This discussion document describes a method to indicate a sender constraint within JWT. It could potentially be incorporated into POP spec.},
}