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Cai, J.; Tang, H.; Xu, L.; Wang, X.; Yang, C.; Ruan, S.; Guo, J.; Hu, S.; Wang, Z. . (2012). Fibroblasts in omentum activated by tumor cells promote ovarian cancer growth, adhesion and invasiveness. Carcinogenesis, 33(1), 20–29. doi:10.1093/carcin/bgr230 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research