@article{MO_1999_a4,
     author = {S. V. Popov},
     title = {The {``Tuimaada"} {International} {Math} {Olympiad's} {Problems}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {102--121},
     publisher = {mathdoc},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_1999_a4/}
}