M. Amar et V. Decicco, RELAXATION OF QUASI-CONVEX INTEGRALS OF ARBITRARY ORDER, Proceedings of the Royal Society of Edinburgh. Section A. Mathematics, 124, 1994, pp. 927-946
An integral representation result is given for the lower semicontinuou
s envelope of the functional integral(OMEGA)f(del(k) u) dx on the spac
e BV(k) (OMEGA: R(m)) of the integrable functions, whose the k-th deri
vative in the sense of distributions is a Radon measure with bounded t
otal variation.