%0 Journal Article %A Andrea Bonfiglioli %A Francesco Uguzzoni %T Some non-existence results for critical equations on step-two stratified groups %J Comptes Rendus. Mathématique %D 2003 %P 817-822 %V 336 %N 10 %I Elsevier %R 10.1016/S1631-073X(03)00193-6 %G en %F CRMATH_2003__336_10_817_0