<li>[https://www.ec.gc.ca/grandslacs-greatlakes/default.asp?lang=En&n=6201FD24-1 Environment Canada on Phosphorus and Excess Algal Growth ]</li> | <li>[https://www.ec.gc.ca/grandslacs-greatlakes/default.asp?lang=En&n=6201FD24-1 Environment Canada on Phosphorus and Excess Algal Growth ]</li> |