- Refsum disease information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS).www.ninds.nih.gov/health_and_medical/disorders/refsum_doc.htm
- Finding a cure for RP (retinitis pigmentosa), macular degeneration, Usher syndrome, and other retinal degenerations ...www.srpf.a.se/forsk/refsum.html
