Friak, M.; Nikolov, S.; Petrov, M.; Sachs, C.; Ma, D.; Fabritius, H.; Lymperakis, L.; Raabe, D.; Neugebauer, J.: Ab-initio based multi-scale approaches to the elasticity of metallic polycrystals and hierarchical biocomposites. Lecture: XI National Congress on Theoretical and Applied Mechanics, Borovets, Bulgaria, September 02, 2009 - September 05, 2009