Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2020_9_a9, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 1--4}, journal = {Kvant}, pages = {43}, publisher = {mathdoc}, number = {9}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2020_9_a9/} }
Задачи 1--4. Kvant, no. 9 (2020). http://geodesic.mathdoc.fr/item/KVANT_2020_9_a9/