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Jin-Zhi Du; Tian-Meng Sun; Wen-Jing Song; Juan Wu; Jun Wang. (2010). A Tumor-Acidity-Activated Charge-Conversional Nanogel as an Intelligent Vehicle for Promoted Tumoral-Cell Uptake and Drug Delivery. , 49(21), 3621–3626. doi:10.1002/anie.200907210 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research