1. Parkinson's Disease Society. Meeting a need? London: Parkinson's Disease Society, 1994
2. A five-year study of the incidence of dyskinesia in patients with early Parkinson's disease who were treated with ropinirole or levodopa;Rascol;N Engl J Med,2000
3. Pramipexole versus levodopa as initial treatment for Parkinson's disease;Parkinson Study Group;JAMA,2000
4. A 5 year double blind study with cabergoline versus levodopa in the treatment of early Parkinson's disease;Rinne;Parkinsonism Related Disord,1999
5. Pergolide versus levodopa monotherapy (PELMOPET);Oertel;Movement Disord,2000