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@article{MZM_1989_46_1_a16, author = {D. N. Cheban}, title = {A problem of {J.~Hale}}, journal = {Matemati\v{c}eskie zametki}, pages = {120--121}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_1_a16/} }
D. N. Cheban. A problem of J.~Hale. Matematičeskie zametki, Tome 46 (1989) no. 1, pp. 120-121. http://geodesic.mathdoc.fr/item/MZM_1989_46_1_a16/