1. Maxwell, C. (1890) Scientific Papers. II. Camb. Univ. Press, 175–177.
2. Michell, A.G.M. (1904) The limit of economy of material in frame structures. Phil Mag., Ser.
6, 8 (47), 589–597.
3. Prager, W. (1974) Introduction to structural optimization. Udine, Springer-Verlag.
4. Rozvany, G.I.N., Bendsoe, M.P., and Kirsch, U. (1995) Layout optimization of structures. Appl. Mech. Rev. (ASME), 48, 41–119.
5. Hemp, W.S. (1973) Optimum structures. Oxford, Clarendon Press.