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WikiPedia: Chu_trình_photpho http://www.lenntech.com/phosphorus-cycle.htm http://www.phschool.com/atschool/biology/Dragonfly... http://filebox.vt.edu/users/chagedor/biol_4684/Cyc... http://www.epa.gov/volunteer/stream/vms56.html http://www.enviroliteracy.org/article.php/480.html https://web.archive.org/web/20080914101357/http://...