New papers were added to the CvGmt Preprint Server - http://cvgmt.sns.it/ Title: Rigidity and lack of rigidity for solenoidal matrix fields Author: Garroni, Adriana Author: Nesi, Vincenzo http://cvgmt.sns.it/papers/garnes02/ Title: The Singular Set of Solutions to Non Differentiable Elliptic Systems Author: Mingione, Giuseppe http://cvgmt.sns.it/papers/min02/