Chris J. Hass, Paul Malczak, Joe Nocera, Elizabeth L. Stegemöller, Aparna Shukala, Irene Malaty, Charles E. Jacobson, Michael S. Okun, Nick McFarland,
Quantitative Normative Gait Data in a Large Cohort of Ambulatory Persons with Parkinson’s Disease PLoS ONE. ,vol. 7, pp. e42337- ,(2012) ,
10.1371/JOURNAL.PONE.0042337