%% You should probably cite draft-ietf-core-groupcomm-bis instead of this I-D.
@techreport{dijk-core-groupcomm-bis-01,
    number =    {draft-dijk-core-groupcomm-bis-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-dijk-core-groupcomm-bis/01/},
    author =    {Esko Dijk and Chonggang Wang and Marco Tiloca},
    title =     {{Group Communication for the Constrained Application Protocol (CoAP)}},
    pagetotal = 27,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document specifies the use of the Constrained Application Protocol (CoAP) for group communication, using UDP/IP multicast as the underlying data transport. The target application area is any group communication use cases in resource-constrained networks. Both unsecured and secured CoAP group communication are specified. Security is achieved by use of the Group Object Security for Constrained RESTful Environments (Group OSCORE) protocol. Aspects of operation of using multicast CoAP in combination with CoAP block-wise transfers and CoAP observe are also specified.},
}