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3. On the parametric excitation of a dynamic system having multiple degrees of freedom;Hsu;Trans. ASME, Ser. E,1963
4. Buckling of truncated conical shells under axial compression;Tani;AIAA J,1970
5. Free transverse vibrations of truncated conical shells;Tani;Rep. Inst. High Speed Mech. Tohoku Univ,1971