1. Technological Guide Lines for ASE-Components. Wilnsdorf, Germany: Schuler Hydroforming GmbH and Co., April, 1996.
2. Sauer WJ, Gotera A, Robb F, Huang P. Free bulge forming of tubes under internal pressure and axial compression. Proceedings of the Sixth North American Manufacturing Research Conference (NAMRC-6). Gainsville (FL, USA): 1978:228–235.
3. Geckeler JW. Plastisches Knicken der Wandung von Hohlzylindern und einige andere Faltungserscheinungen an Schalen und Blechen. Zeitschrift für angewandte Mathematik und Mechanik, Band 8, Heft 5. Oktober, 1928:341–351.
4. Hydroforming—a method to manufacture light-weight parts;Dohman;Journal of Materials Processing Technology,1996
5. Asnafi N. Hydroformability of extra high-strength steels in structural tubular applications—an analysis based on literature survey. Swedish Institute for Metals Research, Report No. IM-3521, September, 1997.