1. S. A. Lychev and Yu. N. Saifutdinov, “Dynamics of a deep spherical sandwich shell,” Vesn. ChGPU im. I. Ya. Yakovleva, Mekh. Pred. Sost., No. 2, 54–90 (2007).
2. S. A. Lychev and Yu. A. Sidorov, “Nonstationary vibrations of spherical sandwich shells with a multiple spectrum,” Izv. Vuz. Stroit., No. 4, 31–39 (2001).
3. S. P. Orlenko, “Numerical simulation of the dynamics of a three-layer spherical shell with a discrete inhomogeneous core,” Dop. NAN Ukrainy, No. 3, 19–27 (2020).
4. S. P. Rychkov, Structure Modeling in Femap with NX Nastran [in Russian], DMK Press, Moscow (2013).
5. S. P. Timoshenko and S. Woinowsky-Krieger, Theory of Plates and Shells, McGraw-Hill, New York (1959).