@article{MZM_1999_65_5_a10,
     author = {S. Ya. Havinson},
     title = {Extremal problems for {Golubev} sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {738--745},
     year = {1999},
     volume = {65},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_5_a10/}
}