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Holloway, Julianne L.; Ma, Henry; Rai, Reena; Hankenson, Kurt D.; Burdick, Jason A. . (2015). Synergistic Effects of SDF-1α and BMP-2 Delivery from Proteolytically Degradable Hyaluronic Acid Hydrogels for Bone Repair. Macromolecular Bioscience, 15(9), 1218–1223. doi:10.1002/mabi.201500178 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research