1. Donnell, L. H., Stability of Thin-Walled Tubes under Torsion, NACA Report 479, Washington, D.C., 1933.
2. Abir, D., Nardo, S. V., and Hoff, N. J., Thermal Buckling of Circular Cylindrical Shells Under Circumferential Temperature Gradients, Section 2 of Thermal Buckling of Circular Cylindrical and Conical Thin-Walled Shells, WADC Technical Report 58-104, ASTIA Document No. AD 151068, WADC, April, 1958.