Requirements for an Internet Audio Codec. - Jean-Marc Valin; Koen Vos (RFC, 2011)

Guidelines for Development of an Audio Codec within the IETF. - Jean-Marc Valin; Slava Borilin; Koen Vos; Christopher Montgomery; Raymond (Juin-Hwey) Chen (RFC, 2012)

Definition of the Opus Audio Codec. - Jean-Marc Valin; Koen Vos; Timothy B. Terriberry (RFC, 2012)

RTP Payload Format for the Opus Speech and Audio Codec. - Julian Spittka; Koen Vos; Jean-Marc Valin (RFC, 2015)

High-Quality, Low-Delay Music Coding in the Opus Codec. - Jean-Marc Valin; Gregory Maxwell; Timothy B. Terriberry; Koen Vos (CoRR, 2016)

Updates to the Opus Audio Codec. - Jean-Marc Valin; Koen Vos (RFC, 2017)