1. Age at onset—the major determinant of outcome in Parkinson's disease;Hely;Acta Neurol. Scand.,1995
2. Handwriting analysis of several extrapyramidal disorders;Boisseau;Can. Soc. Forensic Sci. J.,1987
3. Motor functions of the basal ganglia;Phillips;Psychol. Res.,1993
4. W.R. Harrison, Suspect Documents—Their Scientific Examination, Chicago, Nelson-Fox, 1958, pp. 403, 404, 411, 412.
5. A.S. Osborn, Questioned Documents, 2nd ed., 1929, Patterson Smith, Montclair, NJ (reprinted in 1973, pp. 110–114, 332, 333).