Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2021_2_a11, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 21{\textendash}24}, journal = {Kvant}, pages = {34}, publisher = {mathdoc}, number = {2}, year = {2021}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2021_2_a11/} }
Задачи 21–24. Kvant, no. 2 (2021). http://geodesic.mathdoc.fr/item/KVANT_2021_2_a11/