@article{MZM_2023_113_5_a14,
     author = {A. A. Fedotov},
     title = {Close {Turning} {Points} and the {Harper} {Operator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {785--790},
     publisher = {mathdoc},
     volume = {113},
     number = {5},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2023_113_5_a14/}
}