“Asymptotic Representations of Proper Nonoscillation Solutions of a Class of Semilinear Differential Equations of the Second Order” (2001) Neliniini Kolyvannya, 4(2), pp. 190–215. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/164 (Accessed: 22 January 2026).