@article{MZM_1985_37_5_a8,
     author = {V. G. Timofeev},
     title = {Landau inequality for function of several variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {676--689},
     year = {1985},
     volume = {37},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_37_5_a8/}
}