Vibration behaviour of a bio-composite sandwich with auxetic coreKhawla Essassi, Jean-Luc Rebiere, Abderrahim El Mahi, Mahamane Toure, Mohamed amine Ben Souf, Anas Bouguecha and Mohamed HaddarMATEC Web Conf., 283 (2019) 09004DOI: https://doi.org/10.1051/matecconf/201928309004