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@article{MO_2002_23_4_a4, author = {A. Yu. Evnin}, title = {Problems of the {Putnam} {Olympiads}}, journal = {Matemati\v{c}eskoe obrazovanie}, pages = {101--119}, publisher = {mathdoc}, volume = {23}, number = {4}, year = {2002}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MO_2002_23_4_a4/} }
A. Yu. Evnin. Problems of the Putnam Olympiads. Matematičeskoe obrazovanie, Tome 23 (2002) no. 4, pp. 101-119. http://geodesic.mathdoc.fr/item/MO_2002_23_4_a4/