Quantitative Evaluation of Wrist Rigidity in Parkinson's Disease by Natural Frequency Method. - Ugur Dinçer; Günay Züngör; Sabiha Tezcan Aydemir; Fatma Nazli Durmaz Çelik; Evren Samur; Çetin Yilmaz; Muhittin Cenk Akbostanci (SIU, 2023)