公式ページ等 
- Google AI Blog / 2021-02-25: Lyra: A New Very Low-Bitrate Codec for Speech Compression
- W. Bastiaan Kleijn, Andrew Storus, Michael Chinen, Tom Denton, Felicia S. C. Lim, Alejandro Luebs, Jan Skoglund, Hengchin Yeh. Generative Speech Coding with Predictive Variance Regularization. arXiv:2102.09660