1. http://heasarc.gsfc.nasa.gov/docs/xte/XTE.html (Last accessed on 04/04/2012)
2. http://hesperia.gsfc.nasa.gov/rhessi2/ (Last accessed on 20/06/2012)
3. S K Chakrabarti et al Proceedings of the 20th European Rocket and Balloon Programme and related research ESA SP-700 (ed.) L Ouwehand (The Netherlands: ESA Communications) p 581 (2011)
4. S K Chakrabarti et al Proceedings of the 21st European Rocket and Balloon Programme and related Research ESA SP-701 (ed.) L Ouwehand (The Netherlands: ESA Communications) p 663 (2013)
5. N Yajima, N Izustu, T Imamura and T Abe Scientific Balloons (Germany:Springer) (2009)