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Weisstein, Eric W. (27 Oct 2017). "Golden Ratio". Mathworld -- A Wolfram Web Resource. Archived from the original on 22 Aug 2017. Retrieved 28 Oct 2017.
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wolfram.com
mathworld.wolfram.com
Weisstein, Eric W. (27 Oct 2017). "Divisor Function". MathWorld --A Wolfram Web Resource. Archived from the original on 29 Jun 2017. Retrieved 28 Oct 2017.
Weisstein, Eric W. (27 Oct 2017). "Golden Ratio". Mathworld -- A Wolfram Web Resource. Archived from the original on 22 Aug 2017. Retrieved 28 Oct 2017.
Weisstein, Eric W. "Torsion". Wolfram MathWorld. Archived from the original on 29 Aug 2017. Retrieved 28 Oct 2017.