RADIUS Attributes for Tunnel Protocol Support. - Glen Zorn; Dory Leifer; Allan C. Rubens; John Shriver; Matt Holdrege; Ignacio Goyret (RFC, 2000)

Signalling of Modem-On-Hold status in Layer 2 Tunneling Protocol (L2TP). - Ignacio Goyret (RFC, 2003)

Layer Two Tunneling Protocol - Version 3 (L2TPv3). - Jed Lau; W. Mark Townsley; Ignacio Goyret (RFC, 2005)