Marshall T. Rose, Graham Klyne, David H. Crocker. The Application Exchange (APEX) Presence Service. RFC, 3343:1-23, April 2003. [doi]
@article{rfc3343,
title = {The Application Exchange (APEX) Presence Service},
author = {Marshall T. Rose and Graham Klyne and David H. Crocker},
year = {2003},
month = {April},
doi = {10.17487/RFC3343},
url = {https://doi.org/10.17487/RFC3343},
researchr = {https://researchr.org/publication/rfc3343},
cites = {0},
citedby = {0},
journal = {RFC},
volume = {3343},
pages = {1-23},
}