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Olegario-Sanchez, Eleanor; Pelicano, Christian Mark . (2017). Characterization of Philippine Natural Zeolite and its Application for Heavy Metal Removal from Acid Mine Drainage (AMD). Key Engineering Materials, 737(), 407–411. doi:10.4028/www.scientific.net/kem.737.407 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research