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@@ -31007,7 +31007,7 @@ When asked about the algorithm used, Katie replied:
@quotation
It's not that well known but it's not that obscure either.
It's Euler's modification to Newton's method for calculating pi.
-Take a look at lines (23) - (25) here: @uref{http://mathworld.wolfram.com/PiFormulas.htm}.
+Take a look at lines (23) - (25) here: @uref{http://mathworld.wolfram.com/PiFormulas.html}.
The algorithm I wrote simply expands the multiply by 2 and works from
the innermost expression outwards. I used this to program HP calculators