1. 1. K.-J. Bathe, E. L. Wilson, Numerical Methods in Finite Element Analysis, Prentice Hall, Englewood Cliffs, N.J. (1976), https://doi.org/10.1002/nme.1620110913
2. 2. P. P. Vahin, N. V. Ivanova, H. A. Shynkarenko, "On a mathematical model of dynamic deformation of flexible shells," Dopov. Nats. Akad. Nauk Ukr., No. 6, 54-59 (1999) (in Ukrainian).
3. 3. P. P. Vahin, I. Ya. Shot, "On free vibrations of shells compliant to shear and compression," Prykl. Probl. Mekh. Mat., 10, 177-184 (2012) (in Ukrainian).
4. 4. V. Voytovych, V. Horlatch, "Numerical analysis of natural frequencies of threedimensional elastic bodies," Visn. Lviv Univ. Ser. Prykl. Mat. Inform., No. 6, 126-134 (2003) (in Ukrainian).
5. 5. A. S. Vol'mir, Nonlinear Dynamics of Plates and Shells [in Russian], Nauka, Moscow (1972).