1. Biot, M.A. (1939) Nonlinear Theory of Elasticity and the Linearized Case for a Body under Initial Stress. Philosophical Magazine, Vol. 27, Ser. 7, pp. 468–489.
2. Fung, Y.C. (1965) Foundations of Solid Mechanics. Prentice-Hall, Englewood Cliffs, New Jersey.
3. Hu, H.C. (1954) On Some Variational Principles in the Theory of Elasticity and the Theory of Plasticity. Acta Physica Sinica, Vol. 10, p. 259. (Also, Scientia Sinica, Vol. 4, p. 33, 1955.)
4. Kirchhoff, G. (1883) Vorlesungen über math. Physik, Mechanik, 3rd Ed. Leipzig.
5. Love, A.E.H. (1927) A Treatise on the Mathematical Theory of Elasticity, 4th Ed. Cambridge University Press. (Also, Dover Publications, first American edition, 1944.)