1. The Age of Spiritual Machines: When Computers Exceed Human Intelligence;Kurzweil,2000
2. R. Kurzweil, The law of accelerating returns. Available at: http://www.kurzweilai.net/articles/art0134.html.
3. Forecasting the growth of complexity and change;Modis;Technol. Forecast. Soc. Change,2002
4. Technological singularity;Vinge;Whole Earth Rev.,1993
5. Singularity. Available at: http://www.aleph.se/Trans/Global/Singularity/index.html.