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Sais Puigdemont, Gemma; Vidaller Palacín, Antonio; Bigatà Viscasillas, Xavier . (2003). Vasculitis asociadas a enfermedades del tejido conectivo. Piel, 18(3), 127–135. doi:10.1016/S0213-9251(03)72684-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research