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Bartolome C. Bautista; Maria Leonila P. Bautista; Kazuo Oike; Francis T. Wu; Raymundo S. Punongbayan. (2001). A new insight on the geometry of subducting slabs in northern Luzon, Philippines. , 339(3-4), 0–310. doi:10.1016/s0040-1951(01)00120-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research