%% You should probably cite rfc8693 instead of this I-D.
@techreport{ietf-oauth-token-exchange-03,
    number =    {draft-ietf-oauth-token-exchange-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-ietf-oauth-token-exchange/03/},
    author =    {Michael B. Jones and Anthony Nadalin and Brian Campbell and John Bradley and Chuck Mortimore},
    title =     {{OAuth 2.0 Token Exchange: An STS for the REST of Us}},
    pagetotal = 28,
    year =      2015,
    month =     dec,
    day =       14,
    abstract =  {This specification defines a protocol for a lightweight HTTP- and JSON- based Security Token Service (STS) by defining how to request and obtain security tokens from OAuth 2.0 authorization servers, including security tokens employing impersonation and delegation.},
}