1. BBC News (2008)
http://news.bbc.co.uk/1/hi/sci/tech/2732487.stm
. Accessed 24 Apr 2008
2. Jerrett J (2011) Image formation by a concave mirror.
http://www.physics.mun.ca/~jjerrett/mirror/concavem.html
. Accessed 27 Feb 2011
3. Batchelor BG (1999) Characterizing the illumination in an automated visual inspection work cell. In: Miller JWV, Solomon SS, Batchelor BG
4. (eds) Proceedings of the SPIE. Machine vision systems for inspection and metrology VIII, Vol 3836, pp. 134-143, 1999
5. Spherical mirrors (2011) Wikipedia
http://en.wikipedia.org/wiki/Spherical_coordinates
. Accessed 1 Mar 2011