Some remarks on lower semicontinuity Irene FonsecaGiovanni Leoni 49J4549Q20functions of bounded variationlower semicontinuityconvexitypolyconvexity Indiana University Mathematics Journal 2000 text pdf 10.1512/iumj.2000.49.1791 10.1512/iumj.2000.49.1791 en Indiana Univ. Math. J. 49 (2000) 617 - 636 state-of-the-art mathematics http://iumj.org/access/