Zernov, A. E., & Kuzina, Y. V. (2002). 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. Ukrains’kyi Matematychnyi Zhurnal, 54(12), 1698-1703. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4209