@article{MZM_1990_47_3_a10,
     author = {V. A. Plaksin},
     title = {On a~question of {Hua} {Loo-Keng}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {78--90},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_3_a10/}
}