1. 1) Timoshenko, S. P. and Gere, J. M.: THEORY OF ELASTIC STABILITY, 2nd Ed., McGraw-Hill, 1961.
2. 2) Vlasov, V. Z.: Thin-walled Elastic Beams. Israel Program for Scientific Translations, Ltd., Jerusalem, 1961.
3. 3) Roik, K., Carl, J. und Lindner, J.: Biegetorsionsprobleme gerader dünnwandiger Stäbe, Verlag von Wilhelm Ernst und Sohn, 1972.
4. 4) Sakai, F.: Unified Formulation of Basic Equations of Elastic Stability for Thin-walled Members with Open Cross-section, Proc. of the Japan Society of Civil Engineers, No. 221, pp. 1-15, 1974-1 (in Japanese).
5. 5) Nishino, F., Kasemset, C. and Lee, S. L.: Variational Formulations of Stability Problems for Thin-walled members, Ingenier-Archiev, Band 43, Heft 1, pp. 58-68, 1973.