%0 Journal Article %A Kružík, Martin %T Quasiconvexity at the boundary and concentration effects generated by gradients %J ESAIM: Control, Optimisation and Calculus of Variations %D 2013 %P 679-700 %V 19 %N 3 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/cocv/2012028/ %R 10.1051/cocv/2012028 %G en %F COCV_2013__19_3_679_0