1. BEESAT, 2007. Technical University of Berlin, Institute of Aeronautics and Astronautics, Department of Astronautics, BeeSat, Berlin Experimental and Educational Satellite. Retrieved from 〈http://www.beesat.de/〉 on August 30, 2007.
2. Asteroid Rendezvous, Near Shoemaker's Adventures at Eros;Bell,2002
3. Crandall, W.B.C., Gorman, L., Von der Dunk, F., Elvis, M., Lauretta, D., Puig-Suari, J., Seastrand, A., Sonter, M., 2009. Why Space, Open Letter to the United States Human Space Flight Plans Committee, Retrieved on October 22, 2009 at 〈http://www.nasa.gov/pdf/383154main_53%20-%2020090803.7.toAugustineCommittee-2009-08-03.pdf〉
4. ESA, 2010a. ESA Homepage: Solar Orbiter Mission Summary, retrieved on January 20, 2010 from 〈http://sci.esa.int/science-e/www/area/index.cfm?fareaid=45〉
5. ESA, 2010b. ESA Homepage: Sancho study: designing the minimum Earth escape spacecraft. Retrieved on January 20, 2010 from 〈http://www.esa.int/SPECIALS/NEO/SEMVXVB1S6F_0.html〉