J.-P. L. Serfontein, O. Damm, N. Sacks, W. T. Gerber, and M. J. Botha, “DIE SHEET HYDROFORMING OF A COMPLEX-SHAPED AA2024-W AIRCRAFT SKIN PANEL — FROM CONCEPT TO FINAL COMPONENT”, S AFR J IND ENG, vol. 32, no. 4, pp. 13–27, Dec. 2021.