@article{DA_2018_25_4_a6,
     author = {A. A. Sapozhenko and V. G. Sargsyan},
     title = {The number of $k$-sumsets in an {Abelian} group},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {97--111},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2018_25_4_a6/}
}