1. Bostrom N (1998) How long before superintelligence? Accessed 22 Aug 2016. http://www.nickbostrom.com/superintelligence.html
2. Bostrom N (2002) Existential risks: analyzing human extinction scenarios and related hazards. J Evol Technol 9(1). Accessed 24 April 2016. http://www.jetpress.org/volume9/risks.html
3. Bostrom N (2003) Ethical issues in advanced artificial intelligence. Accessed 9 March 2016. http://www.nickbostrom.com/ethics/ai.html
4. Bostrom N (2014) Superintelligence: paths, dangers, strategies. Oxford University Press, Oxford
5. Butler S (1872) 2002. Erewhon. Dover Publications, New York