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Thomas Scholzen; Johannes Gerdes. (2000). The Ki-67 protein: From the known and the unknown. , 182(3), 311–322. doi:10.1002/(sici)1097-4652(200003)182:3<311::aid-jcp1>3.0.co;2-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research