1 Erratum to: Int. J. Dynam. Control DOI 10.1007/s40435-014-0091-8
A misunderstanding during the proofreading process resulted in an error in Eq. (4) on the second page. The correct version of the Eq. (4) is given as below:
$$\begin{aligned} x^{{*}}&=a_0 (t)+\sum _{k=1}^N {b_k (t)\cos (k\theta )+c_k (t)\sin (k\theta )} , \nonumber \\ x^{\tau {*}}\!&=a_0^\tau (t)+\sum _{k=1}^N {[(b_k^\tau (t)\cos (k\theta ^{\tau })\!-\!c_k^\tau (t)\sin (k\theta ^{\tau })]\cos (k\theta )} \nonumber \\&\quad +[b_k^\tau (t)\sin (k\theta ^{\tau })+c_k^\tau (t)\cos (k\theta ^{\tau })]\sin (k\theta ) \end{aligned}$$
(4)
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The online version of the original article can be found under doi:10.1007/s40435-014-0091-8.
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Luo, A.C.J., Jin, H. Erratum to: Complex period-1 motions of a periodically forced Duffing oscillator with a time-delay feedback. Int. J. Dynam. Control 3, 480 (2015). https://doi.org/10.1007/s40435-014-0109-2
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DOI: https://doi.org/10.1007/s40435-014-0109-2