1. http://ectn-assoc.cpe.fr/association/s%26bl/statutes_2013.htm
(last access February 2014)
2. http://ectn-assoc.cpe.fr/
(last access February 2014)
3. http://ectn-assoc.cpe.fr/network/ectn2.htm
(last access February 2014)
4. http://ectn-assoc.cpe.fr/echemtest/
(last access February 2014)
5. Lecture Notes in Computer Science;A. Laganá,2005