ProsenyukL. G. (1994) “Existence and asymptotic behavior of solutions of an $n$-th-order differential equation partially solved with respect to derivative”, Ukrains’kyi Matematychnyi Zhurnal, 46(4), pp. 450–453. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5746 (Accessed: 27July2024).