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materials/ Lenntetch B. V. (2016). Phosphorus cycle: Lenntech. Allikas: Lenntech: http://www.lenntech.com/phosphorus-cycle.htm Lung, D. (29. detsember 2015. a.). Rodenticide Toxicity: Medscape. Allikas: Medscape: http://emedicine.medscape.com/article/818130-overview Mendelejev, D. (2013). Keemiliste elementide perioodilusustabel. Tallinn: Avita. Peltier, K. (26. november 2014. a.). Phosphates: Green cleaning. Allikas: About: http://greencleaning.about.com/od/GreenCleaningResources/g/Phosphates-What- They-Are-How-Theyre-Used-In-Cleaning-and-More.htm Schmundt, H. (2010). Experts Warn of Impending Phosphorus Crisis. Spiegel . Zimth, B. (2. Juuni 2015. a.). Phosphorus: Prezi. Allikas: https://prezi.com/1niyxgsaqt9n/phosphorus/ Zone/Chemestry. (2004). Chemestry/P. Allikas: Zone.ee: http://web.zone.ee/chemistry/p.htm Taskutark. (kuupäev puudub). Fosfor: Taskutark. Allikas: Taskutark: http://www.taskutark.ee/m/fosfor/?auth=dGFza3V0YXJr Toxnet. (1. detsember 2006. a.)