We are solved analytically and numerically by exact space treatment, proposed for elastic plates by Novatsky, the problems of determination of free vibrations of thin piezoelectric plates and shells frequences and mode comparision with Kirchoff theory, showing that in contrast to pure elastic case, the tables of frequences obtained by space treatment and by hypothesis are quite different. During last eight years you obtained the some results for magnetoelastic and ferromagnetic thin plates and shells, almost for all cases it is shown that Kirchoff hypothesis is not applicable. It's necessary discussion of these results.
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