@article{TRSPY_2018_303_a16,
     author = {K. Ford},
     title = {Extremal properties of product sets},
     journal = {Informatics and Automation},
     pages = {239--245},
     publisher = {mathdoc},
     volume = {303},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2018_303_a16/}
}