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- 1965, Books from Hungary - Volumes 7-9, page 26:
- The book deals with cerebral injuries impeding the clinical appearance of ballism, particularly stressing interrelations of ballism and chorea.
- 2012, Robert B. Daroff, Gerald M Fenichel, Joseph Jankovic, Neurology in Clinical Practice, →ISBN:
- Ballism overlaps with choreas, and both movements may coexist.