Tuan, Trinh Anh, et al. “Vibration Analysis of Cross-Ply Laminated Composite Doubly Curved Shallow Shell Panels With Stiffeners”. <i>Vietnam Journal of Science and Technology</i>, vol. 55, no. 3, June 2017, pp. 382-9, doi:10.15625/2525-2518/55/3/8823.