Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2020_2_a12, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 21--24}, journal = {Kvant}, pages = {28}, publisher = {mathdoc}, number = {2}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2020_2_a12/} }
Задачи 21--24. Kvant, no. 2 (2020). http://geodesic.mathdoc.fr/item/KVANT_2020_2_a12/