Влайков, Г. Г., А. Я. Григоренко, and Л. В. Соколова. “Free Vibration of Anisotropic Cylindrical Shells With Variable Parameters”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 12(63), June 2013, pp. 13-16, doi:10.15587/1729-4061.2013.14870.