Avramenko, O. and Naradovyi, V. 2025. Benjamin–-Feir Instability of Interfacial Gravity–Capillary Waves in a Two-Layer Fluid. Part I. East European Journal of Physics. 3 (Sep. 2025), 239-248. DOI:https://doi.org/10.26565/2312-4334-2025-3-21.