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In this formula in the article
has wrong dimensionality.
Truly dimensionality of is dimensionality of energy.--Sergius (talk) 11:49, 23 August 2013 (CEST)
Just in case there is old version of formula
with different dimensionality of 1st and 2nd items.--Sergius (talk) 12:05, 23 August 2013 (CEST)