1. On reciprocal figures, frames and diagrams of forces;Maxwell;Trans. Royal Soc. Edinburgh,1872
2. The limits of economy of material in frame structures;Michell;Phil. Mag. S6,1904
3. Optimal load transmission by flexure;Rozvany;Comp. Meths. Appl. Mech. Eng.,1972
4. Introduction to structural optimization;Prager,1974
5. Optimization of structural geometry;Prager,1977