[1] Niordson FI (1984) Free vibration of thin elastic spherical shells. Int J Sol & Structures 20: 667–687.

[2] Ramakrishnan CV, Shah AH (1970) Vibration of aeolotropic spherical shells. J Acoust Sot Amer 47: 1366–1374.

[3] Hoppmann WH, Baronet CN (1963) A study of the vibrations of shallow spherical shells. Trans ASME, J ApplMech 30: 326–334.

[4] Ross EW (1965) Natural frequencies and mode shapes for axisymmetric vibrations of deep spherical shells. ASME, J ApplMech 32: 553–561.

[5] Navaratna DR (1966) Natural vibration of deep spherical shells. AIAA J 4: 2056–2058.

[6] Lam KY, Loy CT (1995) Influence of boundary conditions and fiber orientation on the natural frequencies of thin orthotropic laminated cylindrical shells. Compos Struct31: 21–30.

[7] Archer RR (1962) On the influence of uniform stress states on the natural frequencies of spherical shells.Transactions of the American Society of Mechanical Engineers, Journal of Applied Mechanics 29: 502–505.

[8] Goncalves PB (1994) Axisymmetric vibrations of imperfect shallow spherical caps under pressure loading. Journal of Sound and Vibration 174(2): 249–260.

[9] Ganesan N,Kadoli R (2004) Studies on linear thermoelastic buckling and free vibration analysis of geometrically perfect hemispherical shells with cut-out. J Sound & Vibration 27(7): 855–879.

[10] Lam KY, Qian Wu (2000) Free vibration of symmetric angle-ply thick laminated composite cylindrical shells. J Compos: part 31: 345–354.

[11] Sang-Youl Lee, Dae-Seouk Chung (2010) Finite element delamination model for vibrating composite spherical shell panels with central cutouts. Finite Elements in Analysis and Design 46(3): 247–256.

[12] Mohamad S Qatu, EbrahimAsadi (2012) Vibration of doubly curved shallow shells with arbitrary boundaries. Applied Acoustics 73(1): 21–27.

[13] Koteswara D Rao, Blessington PJ, R Tarapada (2012) Finite element modeling and analysis of functionally graded (FG) composite shell structures. Procedia Engineering 38: 3192–3199.

[14] YegaoQu, Xinhua Long, Shihao Wu, GuangMeng (2013) A unified formulation for vibration analysis of composite laminated shells of revolution including shear deformation and rotary inertia. Composite Structures 98: 169–191.

[15] Hosseini-Hashemi SH, Fadaee M (2011) On the free vibration of moderately thick spherical shell panel–A new exact closed-form procedure. J Sound Vib 330(17):4352–4367.

[16] Sai Ram KS, SreedharBabu T (2002) Free vibration of composite spherical shell cap with and without a cutout. Computers and Structures 80: 749–1756.

[17] Kadoli R,Ganesan N (2005) A theoretical analysis of linear thermoelastic buckling of composite hemispherical shells with a cut-out at the apex. J Composite Structures 68: 87–101.

[18] Toorani MH,Lakis AA (2000) General equations of anisotropic plates and shells including transverse shear deformations, rotary inertia and initial curvature effects. J Sound Vib 237(4): 561–615.

[19] Kraus H (1967) Thin elastic shells, Chap 1, John Wiely, New York.

[20] Gautham BP,Ganesan N (1992) Free Vibration Analysis of Thick Spherical Shells. J Computers & Structures 45(2): 307–313.