Filippov, S. B., et al. “Free Vibrations and Buckling of a Thin Cylindrical Shell of Variable Thickness With Curvelinear Edge”. Technische Mechanik - European Journal of Engineering Mechanics, vol. 25, no. 1, Aug. 2019, pp. 1-8, https://journals.ub.ovgu.de/index.php/techmech/article/view/887.