%% You should probably cite rfc8974 instead of this I-D.
@techreport{ietf-core-stateless-08,
    number =    {draft-ietf-core-stateless-08},
    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-core-stateless/08/},
    author =    {Klaus Hartke and Michael Richardson},
    title =     {{Extended Tokens and Stateless Clients in the Constrained Application Protocol (CoAP)}},
    pagetotal = 20,
    year =      2020,
    month =     nov,
    day =       16,
    abstract =  {This document provides considerations for alleviating Constrained Application Protocol (CoAP) clients and intermediaries of keeping per-request state. To facilitate this, this document additionally introduces a new, optional CoAP protocol extension for extended token lengths. This document updates RFCs 7252 and 8323 with an extended definition of the "TKL" field in the CoAP message header.},
}