1.
Vitrychenko IE. On the instability of one nonautonomous essentially nonlinear equation of thenth order. Ukr. Mat. Zhurn. [Internet]. 1999 Jun. 25 [cited 2025 Dec. 6];51(6):835–841. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4670