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X. Z. Shu, K. J. Zhu, . (2001). Chitosan/gelatin microspheres prepared by modified emulsification and ionotropic gelation. Journal of Microencapsulation, 18(2), 237–245. doi:10.1080/02652040010000415 

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