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Liao, Chu-Hang; Fei, Wei; Shen, Zhi-Hao; Yin, Ming-Ping; Lu, Chen . (2014). Expression and distribution of TNF-α and PGE2 of periodontal tissues in rat periodontitis model. Asian Pacific Journal of Tropical Medicine, 7(5), 412–416. doi:10.1016/S1995-7645(14)60067-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research