Relationship of substantia nigra echogenicity and motor function in elderly subjectsDaniela Berg, Georg Becker, Petra Ruprecht-Dörfler et al.|Neurology|2001Cited by 157
Echogenicity of the substantia nigra in relatives of patients with sporadic Parkinson’s diseasePetra Ruprecht-Dörfler, Georg Becker, Gésine L. Alders et al.|NeuroImage|2003Cited by 98