[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 Lunzhou 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)
[6] Yeh Kai-yuan, Tang Ren-ji and Zhen Ji-qing, The bending of elastic circular ring of non-homogeneous and variable cross section under the actions of arbitrary loads, Applied Mathematics and Mechanies. 2, 1 (1982), 1-14.
[7] Reltorys, Karel, Variational Methods in Mathematics, Science and Engineering, D. Reidel Publishing Company Press (sec. ed.) Holland (1980).