1. L. S. Leybenson. A Course of the Theory of Elasticity (in Russian), OGIZ, Moscow, 1947. p. 304.
2. Clearly, the bending of the beam is accompanied by the appearance of a transverse component of the axial force P.
3. The next larger root of ▵ = 0 is k1L =8.986.
4. Compare, for example, S. Timoshenko, Theory of Elastic Stability, McGraw-Hill, New York, 1936, Chapter 1.
5. Compare the remark in the paragraph preceding Section 16.1.