%% You should probably cite rfc7106 instead of this I-D. @techreport{ivov-grouptextchat-purpose-00, number = {draft-ivov-grouptextchat-purpose-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ivov-grouptextchat-purpose/00/}, author = {Emil Ivov}, title = {{A Group Text Chat Purpose for Conference and Service URIs in the Session Initiation Protocol (SIP) Event Package for Conference State}}, pagetotal = 5, year = 2013, month = apr, day = 24, abstract = {This document defines and registers a value of "grouptextchat" ("Group Text Chat") value for the URI \textless{}purpose\textgreater{} element of SIP's Conference Event Package {[}RFC4575{]}.}, }