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Ma, Yufei; Ji, Yuan; Huang, Guoyou; Ling, Kai; Zhang, Xiaohui; Xu, Feng . (2015). Bioprinting 3D cell-laden hydrogel microarray for screening human periodontal ligament stem cell response to extracellular matrix. Biofabrication, 7(4), 044105–. doi:10.1088/1758-5090/7/4/044105 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research