1. Fliigge, W., Stresses in Shells, 2nd ed.Springer Verlag, Berlin/Gottingen/Heidelberg, 1962, pp.214-217.
2. Donnell, L. H., Rept. 479, 1933, NACA.
3. Wang, C. T., Applied Elasticity, McGraw-Hill, New York, 1953, pp.340-342.
4. Novozhilov, V. V., The Theory of Thin Shells, Noordhoff,Groningen, The Netherlands, pp.19-38.