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Proc. R. Soc. A 468, 932–953 (8 April 2012; Published online November 23 2011) (doi:10.1098/rspa.2011.0567)
There is a typo in equation (2.4b) of Jeong-Yun Sun, Shuman Xia, Myoung-Woon Moon, Kyu Hwan Oh and Kyung-Suk Kim, ‘Folding wrinkles of a thin film stiff layer on a soft substrate’.
It is currently published as 
; but it should read as 
(the factor 1/2 was missing).
