Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2019_2_a10, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 21--24}, journal = {Kvant}, pages = {34}, publisher = {mathdoc}, number = {2}, year = {2019}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2019_2_a10/} }
Задачи 21--24. Kvant, no. 2 (2019). http://geodesic.mathdoc.fr/item/KVANT_2019_2_a10/