Vibration of composite thin-walled beams with variable open cross section by a high order implicit algorithmA. El Kaimbillah, O. Bourihane, M. Jamal, B. Braikat, F. Mohri and N. DamilMATEC Web Conf., 286 (2019) 03007DOI: https://doi.org/10.1051/matecconf/201928603007