J.E. Goldberg , J.L. Bogdanoff and L. Marcus, "On the Calculation of Axisymmetric Modes and Frequencies of Conical Shells," J. Acoustical Society of America, Vol. 32 (1960), p. 738.
2.
J.E. Goldberg , A.V. Setlur and D.W. Alspaugh, "Computer Analysis of Non-Circular Cylindrical Shells," Symposium on Shell Structure in Engineering Practice, International Association for Shell Structures, Budapest, Hungary, Vol. 2, September 1965, p. 451.
3.
M.S. Zarghamee and A.R. Robinson, "A Numerical Method for Analysis of Free Vibrations of Spherical Shells," AIAA Journal, Vol. 5 (1967), p. 1256.
4.
H. Kraus, Thin Elastic Shells, John Wiley and Sons, Inc. , New York, 1967, p. 460.