%% You should probably cite draft-ietf-ace-key-groupcomm instead of this I-D.
@techreport{palombini-ace-key-groupcomm-02,
    number =    {draft-palombini-ace-key-groupcomm-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-palombini-ace-key-groupcomm/02/},
    author =    {Francesca Palombini and Marco Tiloca},
    title =     {{Key Provisioning for Group Communication using ACE}},
    pagetotal = 17,
    year =      2018,
    month =     oct,
    day =       22,
    abstract =  {This document defines message formats and procedures for requesting and distributing group keying material using the ACE framework, to protect communications between group members.},
}