Comment on: ``Theoretical analysis and circuit verification for fractional-order chaotic behavior in a new hyperchaotic system'' (Q1792899)

Summary: Some comments on the paper [\textit{L. Liu} and \textit{C. Liu}, ``Theoretical analysis and circuit verification for fractional-order chaotic behavior in a new hyperchaotic system'', ibid. 2014, Article ID 682408, 14 p. (2014; \url{doi:10.1155/2014/682408})] are pointed out in this letter. It is shown in this letter that the claimed hyperchaotic system exhibits a periodic behaviour for the chosen parameters and initial condition. However, the claimed hyperchaotic system exhibits chaotic behaviours for some other parameters.