Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2008_2_a21, title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri}}, journal = {Kvant}, pages = {56--57}, publisher = {mathdoc}, number = {2}, year = {2008}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2008_2_a21/} }
Задачи. Kvant, no. 2 (2008), pp. 56-57. http://geodesic.mathdoc.fr/item/KVANT_2008_2_a21/