Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2017_3_a10, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 20--23}, journal = {Kvant}, pages = {29}, publisher = {mathdoc}, number = {3}, year = {2017}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2017_3_a10/} }
Задачи 20--23. Kvant, no. 3 (2017). http://geodesic.mathdoc.fr/item/KVANT_2017_3_a10/