%% You should probably cite draft-ietf-mlcodec-opus-extension instead of this I-D.
@techreport{valin-opus-extension-00,
    number =    {draft-valin-opus-extension-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-valin-opus-extension/00/},
    author =    {Jean-Marc Valin and Timothy B. Terriberry},
    title =     {{Extension Formatting for the Opus Codec}},
    pagetotal = 6,
    year =      2023,
    month =     mar,
    day =       8,
    abstract =  {This document proposes a mechanism to extend the Opus codec (RFC6716) in a way that maintains inter-operability, while adding optional functionality.},
}