TY - JOUR AU - G. G. Oniani TI - On the relationship between differentiability conditions and existence of a strong gradient JO - Matematičeskie zametki PY - 2005 SP - 93 EP - 98 VL - 77 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2005_77_1_a7/ LA - ru ID - MZM_2005_77_1_a7 ER -