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James Gailit; Colin Clarke; Dawn Newman; Marcia G. Tonnesen; Michael W. Mosesson; Richard A.F. Clark. (1997). Human Fibroblasts Bind Directly to Fibrinogen at RGD Sites through Integrin αvβ3. , 232(1), 0–126. doi:10.1006/excr.1997.3512 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research