%% You should probably cite rfc2661 instead of this I-D. @techreport{ietf-pppext-l2tp-16, number = {draft-ietf-pppext-l2tp-16}, 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-pppext-l2tp/16/}, author = {Andrew J. Valencia and Glen Zorn and William Palter and Gurdeep-Singh Pall and Mark Townsley and Allan Rubens}, title = {{Layer Two Tunneling Protocol "L2TP"}}, pagetotal = 80, year = 1999, month = jun, day = 14, abstract = {This document describes the Layer Two Tunneling Protocol (L2TP). {[}STANDARDS-TRACK{]}}, }