Frontmatter H. Arenhövel, H. Backe, D. Drechsel, J. Friedrich, K. H. Kaiser and Th. Walcher Eur. Phys. J. A, 28 2 (2006) 1-10 Published online: 28 June 2006 DOI: 10.1140/epja/i2006-09-023-4