1. Magnitude 9.0 - near the east coast of Honshu, Japan, in: United States Geological Survey (March 11, 2011). Source: http://earthquake.usgs.gov/earthquakes/eqinthenews/2011/usc0001xgp
2. H. Tabushi, Company believes 3 reactors melted down in Japan. In: The New York Times (May 24, 2011). Source: http://www.nytimes.com/2011/05/25/world/asia/25nuclear.html
3. E. Ackerman, Japan Earthquake: iRobot Sending Packbots and Warriors to Fukushima Dai-1 Nuclear Plant, in: IEEE Spectrum (March 18, 2011). Source: http://spectrum.ieee.org/automaton/robotics/industrial-robots/irobot-sending-packbots-and-warriors-to-fukushima
4. K. Nagatani, S. Kiribayashi, Y. Okada, S. Tadokoro, T. Nishimura, T. Yoshida, E. Koyanagi, Y. Hada, Redesign of rescue mobile robot Quince—toward emergency response to the nuclear accident at Fukushima Daiichi nuclear power station on March 2011, in Proceedings of IEEE International Symposium on Safety, Security, and Rescue Robotics (Kyoto, Japan, 2011) pp. 13–18
5. E. Guizzo, Fukushima robot operator writes tell-all blog, in: IEEE Spectrum (August 23, 2011). Source: http://spectrum.ieee.org/automaton/robotics/industrial-robots/fukushima-robot-operator-diaries