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Du, Binyang; Tsui, Ophelia K. C.; Zhang, Qingling; He, Tianbai . (2001). Study of Elastic Modulus and Yield Strength of Polymer Thin Films Using Atomic Force Microscopy. Langmuir, 17(11), 3286–3291. doi:10.1021/la001434a 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research