Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2017_11_a11, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 9--12}, journal = {Kvant}, pages = {39}, publisher = {mathdoc}, number = {11}, year = {2017}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2017_11_a11/} }
Задачи 9--12. Kvant, no. 11 (2017). http://geodesic.mathdoc.fr/item/KVANT_2017_11_a11/