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Chagnon, G.; Rebouah, M.; Favier, D. . (2015). Hyperelastic Energy Densities for Soft Biological Tissues: A Review. Journal of Elasticity, 120(2), 129–160. doi:10.1007/s10659-014-9508-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research