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when toggle format what by license comment
Apr 14, 2013 at 3:24 history edited Igor Pak CC BY-SA 3.0
update
Jul 25, 2012 at 21:40 comment added Daniel Parry This wasn't the question being asked. I wanted to know who was the first to develop the formula.
Jul 25, 2012 at 4:57 history answered Igor Pak CC BY-SA 3.0