Effective elastic constants of a composite material with a regular pattern of parallel fibres / by P. Meijers and J.J. WijkerInfluence of reduction and interpolation methods on the correlation of calculated and measured modal data of a solar array / by A. de Boer, J.J. Wijker and M.H.M. EllenbroekError localization and mathematical model updating at FSS and the NLR / by A. de Boer, M.H.M. Ellenbroek and J.J. Wijker