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Liang, Chengzhen; Li, Hao; Li, Chan; Yang, Zhiru; Zhou, Xiaopeng; Tao, Yiqing; Xiao, Yuxiang; Li, Fangcai; Chen, Qixin . (2012). Fabrication of a Layered Microstructured Polymeric Microspheres as a Cell Carrier for Nucleus Pulposus Regeneration. Journal of Biomaterials Science, Polymer Edition, ahead-of-print(ahead-of-print), 1–16. doi:10.1163/156856211X614789 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research