D. Park, und J. Knippers. Conference proceeding of the 9th Asian Pacific Conference on Shell and Spatial Structures (APCS2009), Seite 147 – 148. Nagoya Japan, (Mai 2009)
J. Knippers. The Fourth Middle East Symposium on Structural Composites for Infrastructure Applications., Seite 48 – 53. Kairo, Ägypten, Egytian Society of Engineers, (2005)