%0 Journal Article
%A Piotr Gwiazda
%T An existence result for balance laws
 with multifunctions: a model from the theory
 of granular media
%J Colloquium Mathematicum
%D 2003
%P 67-79
%V 97
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm97-1-7/
%R 10.4064/cm97-1-7
%G en
%F 10_4064_cm97_1_7