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Wang, Wei; Ding, Yi; Wang, Yuhui; Song, Xinshan; Ambrose, Richard F.; Ullman, Jeffrey L.; Winfrey, Brandon K.; Wang, Junfeng; Gong, Juan . (2016). Treatment of rich ammonia nitrogen wastewater with polyvinyl alcohol immobilized nitrifier biofortified constructed wetlands. Ecological Engineering, 94(), 7–11. doi:10.1016/j.ecoleng.2016.05.078 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research