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Qing-you Zheng; Ping-ping Li; Feng-suo Jin; Chen Yao; Guo-hui Zhang; Tong Zang; Xing Ai. (2013). Ursolic acid induces ER stress response to activate ASK1–JNK signaling and induce apoptosis in human bladder cancer T24 cells. , 25(1), –. doi:10.1016/j.cellsig.2012.09.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research