@article{MZM_2001_70_5_a3,
     author = {A. Yu. Volovikov},
     title = {On a {Property} of {Functions} on the {Sphere}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {679--690},
     year = {2001},
     volume = {70},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_70_5_a3/}
}