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also [[http://brainvis.wustl.edu/wiki/index.php/Folding/Measurements|Van Essen Lab Folding/Measurements]]
The curvature in general is measured as 1/r, where r is the radius of an inscribed circle. Since mean curvature is the average of the two principal curvatures it has the units of 1/mm. The Gaussian curvature is the product of them, so it is 1/mm^2.
see Mean Curvature