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Zeidler, C; Tsianakas, A; Pereira, M; Ständer, H; Yosipovitch, G; Ständer, S . (2018). Chronic Prurigo of Nodular Type: A Review. Acta Dermato Venereologica, 98(2), 173–179. doi:10.2340/00015555-2774 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research