1. Theory of Elasticity;Timoshenko,1970
2. Lecons sur la Th/'eorie de L'/'Elasticit/'e;Lam/'e,1852
3. Stress optimization in nonhomogeneous materials;Leissa;Dev. Theor. Appl Mechs.,1976
4. Nonhomogeneous polar orthotropic circular disks of varying thickness;Bert,1961