[1] [CITE@en[RFC 3340 - The Application Exchange Core]]
([TIME[2016-02-21 19:44:34 +09:00]] 版)
<https://tools.ietf.org/html/rfc3340>

[2] [CITE@en[RFC 3341 - The Application Exchange (APEX) Access Service]]
([TIME[2016-02-28 20:34:31 +09:00]] 版)
<https://tools.ietf.org/html/rfc3341>

[3] [CITE@en[RFC 3342 - The Application Exchange (APEX) Option Party Pack, Part Deux!]]
([TIME[2016-02-28 20:34:31 +09:00]] 版)
<https://tools.ietf.org/html/rfc3342>

[4] [CITE@en[RFC 3343 - The Application Exchange (APEX) Presence Service]]
([TIME[2016-03-06 17:42:32 +09:00]] 版)
<https://tools.ietf.org/html/rfc3343>

[5] [[BEEP]]