%% You should probably cite rfc8251 instead of this I-D.
@techreport{ietf-codec-opus-update-09,
    number =    {draft-ietf-codec-opus-update-09},
    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-codec-opus-update/09/},
    author =    {Jean-Marc Valin and Koen Vos},
    title =     {{Updates to the Opus Audio Codec}},
    pagetotal = 12,
    year =      2017,
    month =     aug,
    day =       17,
    abstract =  {This document addresses minor issues that were found in the specification of the Opus audio codec in RFC 6716. It updates the nornative decoder implementation included in the appendix of RFC 6716. The changes fixes real and potential security-related issues, as well minor quality-related issues.},
}