References

http://www.ataxia.org/

http://www.mayoclinic.com/health/ataxia/DS00910/DSECTION=causes

http://www.webmd.com/brain/ataxia-friedreichs

http://www.curefa.org/

http://www.answers.com/topic/central-nervous-system

http://en.wikipedia.org/wiki/Central_nervous_system