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Seung Hyun Yoo; David J. Lim. (1993). Ubiquitous presence of chromogranin A in the inner ear of guinea pig. , 317(1-2), 0–117. doi:10.1016/0014-5793(93)81503-r 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research