%0 Journal Article %A N. D. Filonov %T Number of non-zero cubic sums %J Zapiski Nauchnykh Seminarov POMI %D 2018 %P 160-174 %V 469 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2018_469_a6/ %G ru %F ZNSL_2018_469_a6