TY - JOUR AU - Menikoff, A. TI - Hypoelliptic operators with double characteristics JO - Séminaire Goulaouic-Schwartz N1 - talk:10 PY - 1976-1977 SP - 1 EP - 8 PB - Ecole Polytechnique, Centre de Mathématiques UR - https://www.numdam.org/item/SEDP_1976-1977____A9_0/ LA - en ID - SEDP_1976-1977____A9_0 ER -