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Hoang, V.; Delatolla, R.; Abujamel, T.; Mottawea, W.; Gadbois, A.; Laflamme, E.; Stintzi, A. . (2014). Nitrifying moving bed biofilm reactor (MBBR) biofilm and biomass response to long term exposure to 1 °C. Water Research, 49(), 215–224. doi:10.1016/j.watres.2013.11.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research