It is shown that the claim $\left(i\right)$ of Theorem 13 in the commented article is actually not true, i.e., there does not always exist a $(s+1)$th order retarded type input–output equation for a nonlinear time-delay system with observability index $s$. For some special cases the existence of a retarded type input–output equation is described.

中文翻译：

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对“当延迟非线性时滞系统承认中性类型的输入-输出表示时”的评论 [Automatica 49 (2013) 561-567]

结果表明，索赔$\left(\mathrm{一世}\right)$评论文章中的定理 13 实际上是不正确的，即并不总是存在$(秒+\mathrm{1个})$具有可观性指标的非线性时滞系统的三阶延迟型输入输出方程$秒$. 对于某些特殊情况，描述了延迟型输入-输出方程的存在。