Parkinson's disease : current progress, problems and management : proceedings of the Northern European Symposium on Parkinson's Disease, Helsinki, Nov. 6-8, 1979
Parkinson's disease : current progress, problems and management : proceedings of the Northern European Symposium on Parkinson's Disease, Helsinki, Nov. 6-8, 1979
Parkinson's disease : current progress, problems and management : proceedings of the Northern European Symposium on Parkinson's Disease, Helsinki, Nov. 6-8, 1979
Parkinson's disease : current progress, problems and management : proceedings of the Northern European Symposium on Parkinson's Disease, Helsinki, Nov. 6-8, 1979