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Anette Weber; Larissa Langhanki; Alexander Schütz; Christian Wittekind; Friedrich Bootz; Andrea Tannapfel. (2002). Alterations of the INK4a-ARF gene locus in pleomorphic adenoma of the parotid gland. , 198(3), 326–334. doi:10.1002/path.1210 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research