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3. Timoshenko, S.: On the transverse vibration of bars of uniform cross section. Philosophical Magazine43, 125?131 (1922).
4. Cowper, G. R.: The shear coefficient in Timoshenko's beam theory. J. App. Mech.33, 335?340 (1966).
5. Vlasov, V. Z., Leontev, U. N.: Beams, Plates and Shells on Elastic Foundations. Israel Prog. Scientific Translation. 1966.