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A. E. Zernov and Y. V. Kuzina, “Asymptotic Behavior of Solutions of the Cauchy Problem <em class="a-plus-plus">x</em>′ = <em class="a-plus-plus">f</em>(<em class="a-plus-plus">t</em>, <em class="a-plus-plus">x</em>, <em class="a-plus-plus">x</em>′), <em class="a-plus-plus">x</em&gt;(0) = 0”, Ukr. Mat. Zhurn., vol. 54, no. 12, pp. 1698-1703, Dec. 2002.