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Nonnekes, Jorik; de Kam, Digna; Geurts, Alexander CH; Weerdesteyn, Vivian; Bloem, Bastiaan R . (2013). Unraveling the mechanisms underlying postural instability in Parkinson’s disease using dynamic posturography. Expert Review of Neurotherapeutics, 13(12), 1303–1308. doi:10.1586/14737175.2013.839231 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research