- 22:17, December 27, 2014 (diff | hist) . . (+716) . . Category:Rare Commodities (reformatted, included alternate formula, and some for of explanation for the variables.) (VisualEditor)
- 21:57, December 27, 2014 (diff | hist) . . (+40) . . Category:Rare Commodities (explanatory link for erf() function - can't speak for the validity of the other formula components) (VisualEditor)
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