[1] IETF RFC 2445, F. DAWSON and D. STENERSON. Internet Calendaring and Scheduling Core Object Specification (iCalendar). 1998. RFC Publisher. https://www.rfc-editor.org/info/rfc2445. [src][2] IETF RFC 2446, S. SILVERBERG, S. MANSOUR, F. DAWSON and R. HOPSON. iCalendar Transport-Independent Interoperability Protocol (iTIP) Scheduling Events, BusyTime, To-dos and Journal Entries. 1998. RFC Publisher. https://www.rfc-editor.org/info/rfc2446. [src][3] IETF RFC 2447, F. DAWSON, S. MANSOUR and S. SILVERBERG. iCalendar Message-Based Interoperability Protocol (iMIP). 1998. RFC Publisher. https://www.rfc-editor.org/info/rfc2447. [src][4] IETF RFC 2026, S. BRADNER. The Internet Standards Process — Revision 3. 1996. RFC Publisher. https://www.rfc-editor.org/info/rfc2026. [src]