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@article{MO_2007_a6, author = {N. N. Konstantinov}, title = {Does a {Wind} from {Behind} {Trouble} {Birds?}}, journal = {Matemati\v{c}eskoe obrazovanie}, pages = {29--31}, publisher = {mathdoc}, year = {2007}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MO_2007_a6/} }
N. N. Konstantinov. Does a Wind from Behind Trouble Birds?. Matematičeskoe obrazovanie (2007), pp. 29-31. http://geodesic.mathdoc.fr/item/MO_2007_a6/