Vibrations of Cylindrical Shell Structures Filled With Layered Viscoelastic Material Ismoil Safarov, Мuhsin Теshaev, Abdurakhim Marasulov, Tokhir Jurayev and Bahodir Raxmonov E3S Web Conf., 264 (2021) 01027 Published online: 02 June 2021 DOI: 10.1051/e3sconf/202126401027