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Berdova, Maria; Liu, Xuwen; Wiemer, Claudia; Lamperti, Alessio; Tallarida, Grazia; Cianci, Elena; Fanciulli, Marco; Franssila, Sami . (2016). Hardness, elastic modulus, and wear resistance of hafnium oxide-based films grown by atomic layer deposition. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 34(5), 051510–. doi:10.1116/1.4961113 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research