Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2020_3_a9, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 25--28}, journal = {Kvant}, pages = {25}, publisher = {mathdoc}, number = {3}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2020_3_a9/} }
Задачи 25--28. Kvant, no. 3 (2020). http://geodesic.mathdoc.fr/item/KVANT_2020_3_a9/