1. Acerbi, E., and Fusco, N. Semicontinuity problems in the calculus of variations.Arch. Rat. Mech. Anal. 86, 125–145 (1984).
2. Acerbi, E., and Fusco, N. An approximation lemma forW 1,p functions. In:Proc. Symp. Material Instabilities in Continuum Mechanics, edited by J. M. Ball, pp. 1–5. Oxford: Heriot-Watt 1988.
3. Ball, J. M. A version of the fundamental theorem for Young measures. InPDE’s and Continuum Models of Phase Transitions, Lecture Notes in Physics, vol. 344, edited by M. Rascle, D. Serre, and M. Slemrod, pp. 207–215. Springer.
4. Ball, J. M. Sets of gradients with no rank-one connections.J. Math Pures et Appl. 69, 241–259 (1990).
5. Ball, J. M., and James, R. Fine phase mixtures as minimizers of energy.Arch. Rat. Mech. Anal. 100, 15–52 (1987).