%0 Journal Article %A Demoulini, Sophia %T Young measure solutions for nonlinear evolutionary systems of mixed type %J Annales de l'I.H.P. Analyse non linéaire %D 1997 %P 143-162 %V 14 %N 1 %I Gauthier-Villars %U http://archive.numdam.org/item/AIHPC_1997__14_1_143_0/ %G en %F AIHPC_1997__14_1_143_0