Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2020_4_a5, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri}}, journal = {Kvant}, pages = {22}, publisher = {mathdoc}, number = {4}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2020_4_a5/} }
Задачи. Kvant, no. 4 (2020). http://geodesic.mathdoc.fr/item/KVANT_2020_4_a5/