1. G. Alberti and F. Serra Cassano, Non-occurrence of gap for one-dimensional autonomous functionals.Ser. Adv. Math. Appl. Sci. Calculus of variations, homogenization and continuum mechanics18(1993) 1-17.
2. Integral representation of functionals defined on curves of W1,p
3. Lipschitz regularity for minimizers of integral functionals with highly discontinuous integrands
4. G. Buttazzo, Semicontinuity, relaxation and integral representation in the calculus of variations.Pitman Res. Notes Math. Ser.207(1989).
5. A. Cellina,The classical problem of the calculus of variations in the autonomous case: Relaxation and lipschitzianity of solutions. Preprint (2001).