P. K. Gupta,  A Study on Mode of Collapse of Metallic Shells Having Combined Tube-Frusta Geometry Subjected to Axial Compression.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2012, vol. 61(1). 85 - 89
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/5387.