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Li, Huan; Li, Ningning; Zhang, He; Zhang, Yifan; Suo, Hairui; Wang, Ling; Xu, Mingen . (2020). Three-Dimensional Bioprinting of Perfusable Hierarchical Microchannels with Alginate and Silk Fibroin Double Cross-linked Network. 3D Printing and Additive Manufacturing, 7(2), 78–84. doi:10.1089/3dp.2019.0115 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research