1. Yeh Kai-yuan. General solutions on certain problems of elasticity with non-homogeneity and variable thickness, IV. Bending, buckling and free vibration of non-homogeneous variable thickness beams.Journal of Lanzhou University, Special Number of Mechanics. 1 (1979), 133–157. (in Chinese)
2. Yeh Kai-yuan and Xu Jian-yun. General solution on certain problems of elasticity with non-homogeneity and variable thickness, I. Elastic and plastic stress analyses of high speed rotating disc with non-homogeneity and variable thickness under non-homogeneous steady temperature field.Journal of Lanzhou University, Special Number of Mechanics. 1 (1979), 60–74. (in Chinese)
3. Yeh Kai-yuan and Guo Jian-hu. General solutions on certain problems of elasticity with non-homogeneity and variable thickness, II. Bending of arbitray axialsymmetrically non-homogeneous and variable thickness circular plates with holes at centers under arbitrary steady temperature field and arbitrary distributed loads.Journal of Lanzhou University, Special Number of Mechanics. 1 (1979), 75–114. (in Chinese)
4. Yeh Kai-yuan, Li Jin-rong and Li Jin-chao. General solution on certain problems of elasticity with non-homogeneity and variable thickness, III. Bending of two opposite edges simply supported rectangular plates with singly directional non-homogeneity and variable thickness under arbitrary distributed loads.Journal of Lanzhou University, Special Number, of Mechanics. 1 (1979), 115–132. (in Chinese)
5. Yeh Kai-yuan and Shang Xin-chun. General solution on a problem of bending of two opposite edges simply supported rectangular plates with singly directional non-homogeneity and variable thickness under arbitrarily distributed loads-broken line reduction method.Journal of Lanzhou University, Special Number of Mechanics,19 (1983), 58–75. (in Chinese)