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Dr. KATRIN HINRICHS; P. R. HUNT. (1990). Ultrasound as an aid to diagnosis of granulosa cell tumour in the mare. , 22(2), 99–103. doi:10.1111/j.2042-3306.1990.tb04218.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research