%% You should probably cite rfc8263 instead of this I-D.
@techreport{weis-gdoi-rekey-ack-05,
    number =    {draft-weis-gdoi-rekey-ack-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-weis-gdoi-rekey-ack/05/},
    author =    {Brian Weis and Umesh Mangla and Thomas Karl and Nilesh Maheshwari},
    title =     {{GDOI GROUPKEY-PUSH Acknowledgement Message}},
    pagetotal = 15,
    year =      2017,
    month =     mar,
    day =       10,
    abstract =  {The Group Domain of Interpretation (GDOI) includes the ability for a Group Controller/Key Server (GCKS) to provide a set of current Group Member (GM) devices with additional security associations (e.g., to rekey expiring security associations). This memo adds the ability of a GCKS to request the GM devices to return an acknowledgement of receipt of its rekey message, and specifies the acknowledgement method.},
}