Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2020_2_a21, title = {XXVI {{\CYRM}{\cyre}{\cyrzh}{\cyrd}{\cyru}{\cyrn}{\cyra}{\cyrr}{\cyro}{\cyrd}{\cyrn}{\cyra}{\cyrya}} {\cyro}{\cyrl}{\cyri}{\cyrm}{\cyrp}{\cyri}{\cyra}{\cyrd}{\cyra}}, journal = {Kvant}, pages = {62--64}, publisher = {mathdoc}, number = {2}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2020_2_a21/} }
XXVI Международная олимпиада. Kvant, no. 2 (2020), pp. 62-64. http://geodesic.mathdoc.fr/item/KVANT_2020_2_a21/