Opca Awareness 
A site devoted to Olivopontocerebellar Atrophy. It has links, personal stories and a discussion board.
http://alyshia.com/opcaNINDS: Olivopontocerebellar Atrophy
Information sheet compiled by National Institute of Neurological Disorders and Stroke.
http://www.ninds.nih.gov/health_and_medical/disorders/opca_doc.htm
NORD - Olivopontocerebellar Atrophy
Offers synonyms, a general discussion and further resources.
http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Olivopontocerebellar%20Atrophy%2C%20Hereditary
