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Ding, Houzhu; Illsley, Nicholas P.; Chang, Robert C. . (2019). 3D Bioprinted GelMA Based Models for the Study of Trophoblast Cell Invasion. Scientific Reports, 9(1), 18854–. doi:10.1038/s41598-019-55052-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research