TY - JOUR AU - Crandall, Michael G. TI - Semidifferentials, quadratic forms and fully nonlinear elliptic equations of second order JO - Annales de l'I.H.P. Analyse non linéaire PY - 1989 SP - 419 EP - 435 VL - 6 IS - 6 PB - Gauthier-Villars UR - http://www.numdam.org/item/AIHPC_1989__6_6_419_0/ LA - en ID - AIHPC_1989__6_6_419_0 ER -