Yeh, K. Y., B. H. Sun, and F. P. J. Rimrott. 2019. “Buckling of Imperfect Sandwich Cones under Axial Compression-Equivalent-Cylinder Approach. Part II”. Technische Mechanik - European Journal of Engineering Mechanics 15 (1):1-12. https://journals.ub.ovgu.de/index.php/techmech/article/view/1257.