@article{TM_2021_314_a7,
     author = {M\'at\'e Matolcsi and Imre Z. Ruzsa},
     title = {Difference {Sets} and {Positive} {Exponential} {Sums.} {II:} {Cubic} {Residues} in {Cyclic} {Groups}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {145--151},
     publisher = {mathdoc},
     volume = {314},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2021_314_a7/}
}