Effects of Core Softness and Bimodularity of Fibreglass Layers on Flexural Stiffness of Polymer Sandwich StructuresOldřich Šuba, Oldřich Šuba and Soňa RusnákováMATEC Web Conf., 121 (2017) 03022DOI: https://doi.org/10.1051/matecconf/201712103022