@article{MZM_2007_82_1_a16,
     author = {T. \"Ozdo\u{g}an and M. Orbay},
     title = {Letter to the editor},
     journal = {Matemati\v{c}eskie zametki},
     pages = {156},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2007_82_1_a16/}
}