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Mohammad T Ridha; Emmanuel M Cruz. (2001). Effect of biofilter media on water quality and biological performance of the Nile tilapia Oreochromis niloticus L. reared in a simple recirculating system. , 24(2), 0–166. doi:10.1016/s0144-8609(01)00060-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research