%% You should probably cite rfc8486 instead of this I-D.
@techreport{ietf-codec-ambisonics-02,
    number =    {draft-ietf-codec-ambisonics-02},
    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/02/},
    author =    {Jan Skoglund and Michael Graczyk},
    title =     {{Ambisonics in an Ogg Opus Container}},
    pagetotal = 8,
    year =      2017,
    month =     mar,
    day =       27,
    abstract =  {This document defines an extension to the Ogg format to encapsulate ambisonics coded using the Opus audio codec.},
}