@Misc{ dacmar99a, author = { Dacorogna, Bernard and Marcellini, Paolo }, title = { On the solvability of implicit nonlinear systems in the vectorial case }, journal = { Nonlinear Partial Differential Eq., Gui-Qiang Chen et al. Editors, AMS series of Contemporary Mathematics }, year = { 1999 }, volume = { 238 }, pages = { 89-113 }, URL = { http://cvgmt.sns.it/paper/1561/ }, note = { cvgmt preprint} }