@article{MZM_1981_30_5_a9,
     author = {A. I. Ognev},
     title = {Metric properties of a certain class of mappings of a segment},
     journal = {Matemati\v{c}eskie zametki},
     pages = {723--736},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a9/}
}