Kurzweil, Ray. “The Age of Spiritual Machine.” Vaughn JR. "Over the Horizon: Potential Impact of Emerging Trends in Information and Communication Technology on Disability Policy and Practice".  Ignatyev, M. B. "Necessary and sufficient conditions of nanorobot synthesis". Martel, S., Mohammadi, M., Felfoul, O., Lu, Z., Pouponneau P. & David H. (2009). "Flagellated Magnetotactic Bacteria as Controlled MRI-trackable Propulsion and Steering Systems for Medical Nanorobots Operating in the Human Microvasculature". International Journal of Robotics Research28 (4): 571–582. doi:10.1177/0278364908100924. PMC 2772069. PMID 19890435