%% You should probably cite draft-koch-openpgp-webkey-service-17 instead of this revision.
@techreport{koch-openpgp-webkey-service-09,
    number =    {draft-koch-openpgp-webkey-service-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-koch-openpgp-webkey-service/09/},
    author =    {Werner Koch},
    title =     {{OpenPGP Web Key Directory}},
    pagetotal = 18,
    year =      2019,
    month =     nov,
    day =       18,
    abstract =  {This specification describes a service to locate OpenPGP keys by mail address using a Web service and the HTTPS protocol. It also provides a method for secure communication between the key owner and the mail provider to publish and revoke the public key.},
}