Koltsov, Yuriy V., and Valeriy V. Garnaga. “On the Application of Asymtotic Models in the Problem of Acoustic Waves Scattering by Elastic Cylindrical Shell”. Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation, no. 1, Dec. 2003, pp. 61-63, https://vestnik.kubsu.ru/article/view/13.