%% You should probably cite rfc8486 instead of this I-D.
@techreport{ietf-codec-ambisonics-01,
    number =    {draft-ietf-codec-ambisonics-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-ietf-codec-ambisonics/01/},
    author =    {Michael Graczyk and Jan Skoglund},
    title =     {{Ambisonics in an Ogg Opus Container}},
    pagetotal = 10,
    year =      2016,
    month =     nov,
    day =       21,
    abstract =  {This document defines an extension to the Ogg format to encapsulate ambisonics coded using the Opus audio codec.},
}