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R. Bercks. (1967). Über den Nachweis des Tomatenzwergbusch-Virus (<em>tomato bushy stunt virus</em>) in Reben. , 60(3), 273–277. doi:10.1111/j.1439-0434.1967.tb02993.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research