There was a factor of 2 missing in Eq. (36) in the original paper [1] and this error in Eq. (36) has propagated throughout the rest of the paper [1]. For the sake of brevity, only the affected equations are listed in the following: 
U=2·M2l2EI=π2lEI
(36)
 
π2lEI=EBlq
(37)
 
lq=π2EIEB1l
(38)
 
lT=l+π2EIEB1l2l·π2EIEB1l=2πEIEB
(39)
 
lcr=4πEIEB=4πreqx=12.5664reqx
(40)
 
U1=2·M12l1...

References

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Mikata
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Approximate Solutions for a Self-Folding Problem of Carbon Nanotubes
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Zhou
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W.
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Huang
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Y.
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Liu
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