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Robert D. Roer; Kimberly E. Halbrook; Thomas H. Shafer. (2001). Glycosidase activity in the post-ecdysial cuticle of the blue crab, Callinectes sapidus. , 128(4), 0–690. doi:10.1016/s1096-4959(00)00363-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research