1.
Shchegolev SA. A resonance case of the existence of solutions of a quasilinear second-order differential system, which are represented by Fourier series with slowly varying parameters. Ukr. Mat. Zhurn. [Internet]. 1999Feb.25 [cited 2024May10];51(2):285–288. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4612