@article{MZM_2005_77_1_a7,
     author = {G. G. Oniani},
     title = {On the relationship between differentiability conditions and existence of a strong gradient},
     journal = {Matemati\v{c}eskie zametki},
     pages = {93--98},
     publisher = {mathdoc},
     volume = {77},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_1_a7/}
}