1. The restorative benefits of nature: Toward an integrative framework;S. Kaplan;Journal of environmental psychology,1995
2. Brain-computer interface technology: a review of the first international meeting;J. Wolpaw;IEEE transactions on rehabilitation engineering,2000
3. "Emotiv Systems," 21 Dec 2009. [Online]. Available: http://www.emotiv.com/. [Accessed 30 Mar 2013].
4. "NeuroSky," [Online]. Available: www.neurosky.com. [Accessed 2 Oct 2012].
5. "NeuroVigil," [Online]. Available: http://www.neurovigil.com/. [Accessed 2 Oct 2012].