Naumova, N. V. “Local Vibration and Buckling Modes of a Conic Shell: Comparison of Numerical and Asymptotic Results”. Technische Mechanik - European Journal of Engineering Mechanics, vol. 25, no. 3-4, Aug. 2019, pp. 218-29, https://journals.ub.ovgu.de/index.php/techmech/article/view/903.