G. Alessandrini and V. Nesi Elliptic systems and material interpenetration, May 2008
G. Alessandrini and V. Nesi Invertible harmonic mappings, beyond Kneser, December 2007, Enlarged version April 2008
G. Alessandrini and V. Nesi Beltrami operators, non--symmetric elliptic equations and quantitative Jacobian bounds, July 2007
N. Albin. S. Conti and V. Nesi Improved bounds for composites and rigidity of gradient fields, January 2007