1. Geiger M, Celeghini M (2002) Double sheet hydroforming of complex hollow bodies. Ann WPG IX/2:5–10
2. Geiger M, Celeghini M (2003) L’idroformatura delle Lamiere. Lamiera 3
3. Drewes E-J, Blümel K, Lenze F-J (2001) Tube and sheet hydroformed steel components for autobody application. La Revue de Métallurgie-CIT, October:927–935
4. Zhang SH (1999) Developments in hydroforming. J Mater Process Technol 91:236–244
5. Geiger M, Celeghini M (2002) Double sheet hydroforming of complex hollow parts. In: Proc 7th International Conference on Advanced Technology of Plasticity (ICTP) Yokohama, Japan 2:991–996