By Purohit D.   Chaudhuri K.S.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|33|5|671-678

Taylor & Francis Ltd‎(2002)‎

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By Yahr M.D.   Orosz D.   Purohit D.P.   in Parkinsonism and Related Disorders

ISSN:1353-8020|9|4|225-231

Elsevier‎(2003)‎

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