Salloomi, K. N., et al. “Nonlinear Buckling Analysis of Steel Cylindrical Shell With Elliptical Cut-Out Subjected to Longitudinal Compressive Load”. International Journal of Automotive and Mechanical Engineering, vol. 16, no. 2, July 2019, pp. 6723-37, https://doi.org/10.15282/ijame.16.2.2019.19.0506.