1. A. V. SACHENKOV, L. U. BAKTIEVA, 1978, Kazan State University, Kazan, No, 137, 152, Approach to the solution of dynamic stability problems of thin shells, research on the theory of plates and shells (in Russian)
2. The Stability of Rotational Shells with Variable Thickness, Review of Theory of Plates and Shells;ERSHOV,1975
3. Free vibration of circular cylinders of variable thickness;TONIN;Journal of Sound and Vibration,1979
4. Construction of solutions of the equations for free vibration of a cylindrical shell of variable thickness along the directrix;BERGMAN;Journal of Mechanics of Solids,1979
5. Free vibration of a conical shell with variable thickness;IRIE;Journal of Sound and Vibration,1982