Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2007_2_a5, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri}}, journal = {Kvant}, pages = {21}, publisher = {mathdoc}, number = {2}, year = {2007}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2007_2_a5/} }
Задачи. Kvant, no. 2 (2007). http://geodesic.mathdoc.fr/item/KVANT_2007_2_a5/