Schönberger, A. R., Barbe, M. T., Hagelweide, K., Kühn, A. B., Fink, G. R., & Schubotz, R. I. (2013). Joint principles of motor and cognitive dysfunction in Parkinson's disease. Neuropsychologia, 51(8), 1417-1425. doi:10.1016/j.neuropsychologia.2013.04.011.