TY - JOUR AU - Andrea Bonfiglioli AU - Francesco Uguzzoni TI - Some non-existence results for critical equations on step-two stratified groups JO - Comptes Rendus. Mathématique PY - 2003 SP - 817 EP - 822 VL - 336 IS - 10 PB - Elsevier DO - 10.1016/S1631-073X(03)00193-6 LA - en ID - CRMATH_2003__336_10_817_0 ER -