1. Timoshenko, S.P., Gere, J.M.: Theory of Elastic Stability, 2nd ed. McGraw-Hill, New York (1961). Recent Dover ed.: Dover Publications, Mineola, NY (2009).
http://store.doverpublications.com/0486472078.html
2. Wang, C.M., Wang, C.Y., Reddy, J.N.: Exact Solutions for Buckling of Structural Members. CRC Press, Boca Raton, FL (2005).
https://www.crcpress.com/Exact-Solutions-for-Buckling-of-Structural-Members/Wang-Wang/p/book/9780203483534
3. Atanackovic, T.M., Milisavljevic, B.M.: Some estimates for a buckling problem. Acta Mech. 41, 63–71 (1981). doi:
10.1007/BF01246904
4. Smith, W.G.: Analytic solutions for tapered column buckling. Comput. Struct. 28, 677–681 (1988). doi:
10.1016/0045-7949(88)90011-9
5. Eisenberger, M.: Buckling loads for variable cross-section members with variable axial forces. Int. J. Solids Struct. 27, 135–143 (1991). doi:
10.1016/0020-7683(91)90224-4