%% You should probably cite draft-ietf-codec-ambisonics instead of this I-D.
@techreport{graczyk-codec-ambisonics-00,
    number =    {draft-graczyk-codec-ambisonics-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-graczyk-codec-ambisonics/00/},
    author =    {Michael Graczyk},
    title =     {{Ambisonics in an Ogg Opus Container}},
    pagetotal = 5,
    year =      2016,
    month =     may,
    day =       27,
    abstract =  {This document defines an extension to the Ogg format to encapsulate ambisonics coded using the Opus audio codec.},
}