1. History of Strength of Materials;Timoshenko,1953
2. Ensayos de Historia de la Mecánica;Truesdell,1975
3. The shape of the strongest column;Keller;Arch. Ration. Mech. Anal.,1960
4. Strongest column and isoparametric inequalities for eigenvalues;Tadjbakhsh;J. Appl. Math.,1962
5. The strongest column: an energy approach;Taylor;J. Appl. Mech.,1962