1. Die allegemeinen Ansätse der Mechanik der Kontinua;Hellinger;Enz. Math. Wiss.,1914
2. On some variational principles in the theory of elasticity and plasticity;Hu;Scintia Sinica,1955
3. Harmonic waves in three-dimensional elastic composites;Minagawa;Int,l J. Solids Struct.,1976
4. Minagawa, S., Yoshihara, K., and Nemat-Nasser, S. (1992), Analysis of harmonic waves in a composite material with piezoelectric effect, in Int. J. Solids Structures, 1901–1906.
5. General variational methods for elastic waves in composites;Nemat-Nasser;J. Elasticity,1972