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- Sangwin, Chris and Chris Budd. "Analemmatic Sundials: How to build one and why they work;" Plus Magazine: June 2001. (Oct. 21, 2011) http://plus.maths.org/content/os/issue11/features/sundials/index
- Sonderegger, Helmut. (Oct. 22, 2011) http://web.utanet.at/sondereh/sun.htm