1. http://en.wikipedia.org/wiki/RMS\_Titanic
2. http://en.wikipedia.org/wiki//%C3%9Cberlingen_mid-air_collision
3. Hebert J Jacques D Novy M Pachter M Cooperative control of UAVs Proceedings of the 2001 AIAA Guidance, Navigation and Control Conference Montreal, Canada 2001
4. Washburn AR Continuous autorouters with an application to submarines Research report, NPSOR-91-05 Naval Postgraduate School Monterey, USA 1990