@article{MZM_1990_47_2_a2,
     author = {V. G. Durnev},
     title = {Generalization of problem 9.25 from {\textquotedblleft}the {Kourovka} notebook{\textquotedblright}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {15--19},
     year = {1990},
     volume = {47},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_2_a2/}
}