@article{10_21136_CMJ_1978_101509,
     author = {Petzeltov\'a, Hana and Vrbov\'a, Pavla},
     title = {A remark on small divisors problems},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1978},
     doi = {10.21136/CMJ.1978.101509},
     mrnumber = {0482803},
     zbl = {0419.47029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101509/}
}